Answer:
B. 54.4 m/s
Explanation:
Using the equation;
S = ut + 1/2at²
Where;
v is the final velocity
u is the initial velocity,
a is the acceleration,
s is the displacement
Therefore;
975 =(7.55×31.5) + (0.5×a× 31.5²)
975 = 237.825 + 496.125a
496.125a = 737.175
a = 1.486 m/s²
But;
v = u + at
= 7.55 m/s + (1.486 × 31.5)
= 54.355 m/s
= 54.4 m/s
Therefore;
The final velocity is 54.4 m/s
A book, that has a mass of 0.5 grams, is pushed across a table with a force of 20 newtons. What is the acceleration of the book? A. 0.025 m/s2 B. 40 m/s C. 10 m/s2 D. 40 m/s2
Answer: 40 m/s^2
Explanation:
Answer:
10m/s
Explanation:
A device that uses the wet/dry bulb method to measure the ___________________is the sling psychrometer. As seen here, two thermometers are attached to a handle or length of rope and then are spun around in the air for a few minutes.
A) air currents
B) air temperature
C) light intensity
D) relative humidity
I would say the answer is D
A hygrometer is an instrument used to measure relative humidity. ... To determine the relative humidity, the temperatures are taken from the dry-bulb thermometer and the temperature difference between the wet and dry bulb thermometers.
hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer.
The correct answer is D) relative humidity, and a sling psychrometer measures this by comparing the temperatures obtained from a wet and a dry thermometer.
A device that uses the wet/dry bulb method to measure the relative humidity is the sling psychrometer. This device consists of two thermometers, with one being the dry bulb and the other being the wet bulb. The difference in temperature readings between these two allows individuals to determine the relative humidity using a psychrometric chart, which requires a knowledge of the temperature at which air becomes saturated with water vapor (dew point) as well as other related properties of moist air.
The wet-bulb temperature is particularly important in industries such as textile, wood, and chemical processing, where humidity control is crucial. With the use of a psychrometric chart, these measurements enable precise control over the environmental conditions in plant production facilities and other industrial processes.
7. An echo is the result of a reflected_____
Answer:
Its from a reflection of sound waves against a hard surface
Explanation:
Density
(ii) Volume
(b) The length of one side of metal cube is 5.22 cm and its mass is 65.8g. What is the density of the
Cube?
The density of the cube is 0.466 g/cm³.
Explanation:The density of a cube can be calculated by dividing its mass by its volume. The volume of a cube is calculated by cubing the edge length. In this case, the mass of the cube is 65.8 g and the length of one side is 5.22 cm. To find the volume, we cube the length: 5.22 cm * 5.22 cm * 5.22 cm = 141.158088 cm³. Then, we divide the mass by the volume: 65.8 g / 141.158088 cm³ = 0.466 g/cm³.
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WHY DO GRAPHITE AND DIAMOND LOOK DIFFERENT EVEN THOUGH THEY ARE FROM THE SAME ELEMENT?
Answer:
Although graphite and diamond are both composed of carbon atoms, their physical properties are very different. The differences are the result of the atomic structures of the minerals. In graphite the carbon atoms are arranged in layers. As a result, graphite is soft. The great hardness of diamond is the result of the bonds that hold carbon atoms in a network structure.
Explanation:
What is the book sit on a table without movement
Answer:
We know there's two forces acting on a book while it sits on a table:the force of gravity pulling it down, and the normal force of the table acting upward on the book.
Explanation:
Answer:
When the object is at rest, it stays in a balanced condition and so it does not tend to move from its current position unless an external force tend to act on it. When the external force acts on it, there will be a displacement experienced by the object.
When a book is placed on a table, it does not move it is at rest and balanced position. So If you pick up a book from the floor and place it on the table. The potential energy of the book on the desk corresponds to the work required to move the book from the floor to the desk.
What is the weight of a 45 kg box? N
45 kg * 9.8 m/s^2 = 441 N.
Answer:
The force of a mass's weight is defined as its mass * acceleration due to gravity.
On Earth, g is about 9.8 m/s^2. This will be the acceleration due to gravity.
Then, 45 kg * 9.8 m/s^2 = 441 N.
A 3-kg object experiences a temperature rise of 50°C when 1000 joules of heat are added. Using the same substance, which situation would require the same amount of heat to be added? A) A 6-kg mass experiences a temperature rise of 50°C. B) A 3-kg mass experiences a temperature rise of 50°C. C) A 6-kg mass experiences a temperature rise of 100°C. D) A 3-kg mass experiences a temperature rise of 100°C.
Answer:
B
Explanation:
This option is exactly the same as the example. Thus it would require the same amount of heat.
Answer:
B) A 3-kg mass experiences a temperature rise of 50°C.
Explanation:
As we know that the rise in temperature for 3 kg object is 50 degree C then the heat added is given as 1000 J
so here we can say that formula of heat is
[tex]Q = ms\Delta T[/tex]
here we will have
[tex]m = mass[/tex]
s = specific heat capacity
[tex]\Delta T [/tex] = temperature rise
so here if we make all three parameters same to make this heat energy same
so correct answer will be
B) A 3-kg mass experiences a temperature rise of 50°C.
What is the current in a circuit with a 6.0 V battery and a 2.0 Ω resistor?
Answer: As per Ohm's law current= voltage divided by resistance.
Explanation:
So answer is 6/2= 3 amperes.
For this case, we have by definition, that Ohm's Law states that:
[tex]I = \frac {V} {R}[/tex]
Where:
I: It's the current
V: It's the voltage
R: It's the resistance
We have to:
[tex]V = 6V[/tex]
R = 2Ω
Substituting:
[tex]I = \frac {6} {2}\\I = 3[/tex]
Also, we have that the units of the current, by dividing volts between ohms, will be amps.
Thus, the current is [tex]I = 3 \ A[/tex]
Answer:
[tex]I = 3 \ A[/tex]
Which statements describe the use of gamma rays to treat cancer? Check all that apply.
Gamma rays have low energy and a source must be placed in the body.
Gamma rays are absorbed by only the cancer cells.
High-energy gamma rays are directed at a tumor from outside of the body.
Gamma rays kill cancer cells in a tumor.
Gamma rays are applied to a large area of the body.
Answer:
3, 4
Explanation:
High energy gamma rays are directed at a tumor from outside the body & gamma rays kill cancer cells in a tumor on edge.
Gamma rays are used in cancer treatment to kill cancer cells by damaging their DNA.
Explanation:The use of gamma rays in cancer treatment involves the application of high-energy gamma rays to kill cancer cells. Gamma rays have characteristics similar to X-rays and are more penetrating and damaging to living tissue. In radiation therapy, high-energy radiation is used to damage the DNA of cancer cells, preventing them from dividing or killing them. This therapy can be delivered externally using a machine outside the body or internally using a radioactive substance. However, gamma rays are not absorbed only by cancer cells and can also damage healthy cells.
As temperature of this substance rises from 20°C to 50°C, the substance _______ heat and its kinetic energy _________ .
Answer: Absorbs and Increases
Explanation: As temperature of this substance rises from 20°C to 50°C, the substance absorbs heat and its kinetic energy increases.
Hopefully this help you. Have a great day. :)
Answer:
Absorbs, increases.
Explanation:
As we know that the amount of heat absorb or radiate is defined by a parameter called temperature. The change in temperature is defined as the heat absorb or radiate.
In the given situation, the temperature is increased from 20°C to 50°C, this is caused due to the substance's absorption of heat.
And the temperature is defined as the measurement of average kinetic energy of all the particles which are present in object. If any body or object temperature is increasing from 20°C to 50°C than its average velocity or movement of particle becomes fast. This will lead in increase of kinetic energy.
Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? A. It’s a chemical reaction because a new substance has formed. B. It’s a physical change because the water and the salt kept their original properties. C. It’s an example of synthesis because two substances reacted to give one substance. D. It’s a chemical reaction because the water now tastes salty but originally did not.
Answer:
A
Explanation:
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Therefore it can not be any of the other answers because the substance was water at first but now its salty water.
ps what kind of person would drink water after you put salt in it lol.
Compute the resistance in ohms of a lead block 10 cm long and .10 cm^2 in a cross sectional area (p=2.2 x 10^-5 ohm-cm
Answer:
[tex]2.2\cdot 10^{-3} \Omega[/tex]
Explanation:
The resistance of the lead block is given by
[tex]R=\frac{\rho L}{A}[/tex]
where
[tex]\rho = 2.2\cdot 10^{-5}\Omega cm[/tex] is the resistivity of lead
[tex]L = 10 cm[/tex] is the length of the block
[tex]A=0.10 cm^2[/tex] is the cross sectional area of the block
Substituting into the equation, we find
[tex]R=\frac{(2.2\cdot 10^{-5} \Omega cm)(10 cm)}{0.10 cm^2}=2.2\cdot 10^{-3} \Omega[/tex]
Number the steps of stellar evolution in the correct order
Answer:
Step 1 - 4. Nebular cloud of gas and dust.
Step 2. - 2. Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.
Step 3. - 6. Condensed material begins to combine and form a core center, as it warms, a protostar is formed.
Step 4. - 3. Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.
Step 5. - 5. Stellar core heats as it grows; nuclear fusion begins and a star is born.
Step 6. - 1. Nuclear energy runs out; death: possible supernova.
Answer:
A star is a plasma ball held together by its gravity and compressed by a nuclear fusion at some stage in its development. The closest star on Earth is called the Sun. Several other stars can be seen in the night sky, but none of them is comparable to the Sun due to their very large distances to Earth. Traditionally, stars have been grouped into different constellations.
The stars are formed mainly by the collapse of gas vapors consisting of hydrogen due to gravity. Once the star core is formed, it slowly begins to convert hydrogen to helium in the nuclear fusion. The energy generated in the process flows from the center of the star to its surface and later radiates to outer space. The star is in equilibrium because its internal radiation pressure prevents gravity from collapsing further. When a star's hydrogen fuel is exhausted, its final fate depends on its mass: the smallest stars slowly fade away, while the more massive ones expand into red giants. Eventually, the red giants explode as a supernova, spreading various elements into space. Depending on the mass of the exploded star, for example, the remnant of an explosion may remain a neutron star or a black hole.
By observing the motion, luminosity, and spectra of a star, it is possible to determine its other properties such as mass, age, and metal content. There are several different types of stars. The most common tool for classifying them is the Hertzsprung-Russell diagram.
Gravitationally bound star systems of two or more stars are quite common. On a large scale, stars are an important part of galaxy structure, together with interstellar gas and dark matter.
if a boulder has a weight of 675,000 N what is it’s mass
Weight = (mass) x (acceleration of gravity where the object is)
You didn't tell us WHERE the boulder is, so I have to assume that it's on Mars, where the acceleration of gravity is 3.71 m/s².
675,000 N = (mass) (3.71 m/s²)
Mass = (675,000 N) / (3.71 m/s²)
Mass = 181,941 kilograms
The same weight on Earth would suggest a mass of only 68,807 kg, so you can see how important it is to know where you are when you make your measurements.
true or false? In a typical car, the crankshaft produces a linear motion that turns the wheel
Which kind of energy is greater? Potential or kinetic energy?
Answer: it depends potential energy is the build up of kinetic energy like going to the top of a roller coaster. kintic is the use of the potential energy like going down the roller coaster so depends how much energy one another give :)
Hope this helps you out :)
Answer:
Explanation:
The question has no set meaning. Suppose you take a rock to the top of a building. You put the rock over the edge of the building. You don't drop it yet. The potential energy is greatest for the rock under this condition. The kinetic energy is 0 because the rock is not moving.
Now you let the rock go. As it falls, it looses distance to the ground which means that the Potential energy is nearing 0. The Kinetic energy is picking up because the rock is moving faster.
At the bottom of the rock's journey just before it hits the ground, the KE is at a maximum and the PE is nearly 0.
The earth’s orbit is oval in shape . Explain how the magnitude of gravitational force between earth and sun changes as earth moves from position P to Q as shown in the figure.
Answer:
The gravitational force does change believe it or not, but the explaination for this is because the earths orbit is an oval (or a not circle) the closer it nears its self to the sun. the suns gravitational pull, pulls the earth to it bringing it closer and as it reaches the other side lets call this L when it reaches L it becomes the same gravitational pull reset as P is and another section over the sun lets call this M and when it reaches M its the same pull as Q, you get it now?
The change in the magnitude of gravitational force would show that the force is more at Q than at position P
What is Gravitational force?
Gravitational force or force of gravity is the force of attraction between masses in the universe.
This is given by Newtons law of gravitation as;
Force (F) is directly proportional to the product of the masses and inversely proportion to the square of the distance apart.
Since the earth's orbit is oval the distance from the center is not equal at all parts of the orbit hence points closer to the earth has more force of attraction and if it is further apart it will have lesser force of attraction in conformity to the inverse relationship.
From the picture, point P is further apart and will have lesser gravitational force while position Q is closer to the earth amd will hae more force of attraction.
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Those fifty 15 ohm parallel connected Christmas tree lights. Calculate the total current in the circuit if they are connected to a 115 VAC source.
If you have fifty 15-ohm resistors all connected in parallel, their "effective" resistance is (15/50) = 0.3 ohms.
Current = (voltage) / (resistance)
Current = (115 V) / (0.3 ohm)
Current = 383.3 Amperes
This is an interesting question, with a VERRRRY interesting answer. The fuse or circuit breaker that feeds the outlet where these lights are plugged in is most likely rated 15 or 20 or 25 Amperes, and it trips immediately.
But let's say it doesn't ... let's say the juice just keeps on flowing.
Power = (voltage) x (current)
These lights use energy at the rate of (115V)x(383.3A) = 44,083 watts. This is roughly the same as the power used to run 22 toasters or 37 blow-dryers, all at the same time. AND ... the lights are going to produce almost as much heat as 22 toasters or 37 blow-dryers all running at the same time. The lights will probably burn the house down before long.
If electrical energy costs 20¢ per kilowatt-hour in this city, then running those lights for ONE HOUR is going to cost $8.82 !
All in all, it will be a good idea to unplug the Christmas tree lights when the family goes to bed.
The total current in the circuit when 50 parallel-connected 15-Ohm Christmas tree lights are connected to a 115VAC source is 383.5 A.
Explanation:To calculate the total current of 50 parallel connected Christmas tree lights that each have 15 ohms of resistance connected to a source of 115 VAC we will apply Ohm's law which is I = V/R. Here I represents current V represents voltage and R represents resistance.
In a parallel circuit all the resistor leads on one side of the resistors are connected together and all the leads on the other side are connected together. Therefore each resistor in a parallel circuit has the same full voltage of the source applied to it. That said, each of the 50 15-ohm lights will experience the full 115 volts.
So first we calculate the current for one light: I = V/R = 115V/15Ω = 7.67 A. Being a parallel connection each light draws this same current from the power source, so for 50 light the total current I (total) drawn will be 50 * 7.67 A = 383.5 A. Therefore, the total current in the circuit is 383.5 A.
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Different measurements are expressed in different units. Choose the correct SI units for the following types of measurement. The SI units for measuring the velocity of the car: The SI units for measuring the acceleration of the car: The SI units for measuring force: The SI units for measuring mass:
Answer:
Explanation:
Velocity:
Formula : displacement/time
SI unit : m/s
Acceleration :
Formula: change in Velocity/time
SI unit : m/s²
Force:
Formula: mass x acceleration due to gravity
SI unit: N(newton)
Mass:
SI unit: kilogram(kg)
Answer:
1. The SI units for measuring the velocity of the car: meters per second
2.The SI units for measuring the acceleration of the car:meters per secend squared
3.The SI units of measuring force:Newton’s
4.The SI units for measuring mass:kilograms
These are the correct answers on Ed
Choose the false statement regarding resistance.
A)Longer wires have less resistance.
B)Electrical resistance produces heat.
C)Resistance slows the flow of current.
D)The larger the diameter of the wire, the less resistance
'A' is the false one, but 'C' is also so poorly worded that it's misleading.
rollita
What is the current in the 10.0 , resistor?
10.0 0
120.0 V
320.00
30.0 0
2A, is right answer i think
A sample of gas has a volume of 25L at a pressure of 200 kPa and a temperature of 25°C. What would be the volume if the pressure were increased to 250 kPa and the temperature were decreased to 0°C?
Using the combined gas law, we can find that the new volume of the gas would be approximately 22.62 L.
Explanation:In order to find the new volume of the gas when the pressure is increased to 250 kPa and the temperature is decreased to 0°C, we can use the combined gas law.
The combined gas law states that for a given amount of gas, the ratio of pressure, volume, and temperature remains constant:
P1V1/T1 = P2V2/T2
Plugging in the values given in the question, we have:
200 kPa * 25 L / (25 + 273) K = 250 kPa * V2 / (0 + 273) K
Simplifying and solving for V2, we find:
V2 = (200 kPa * 25 L * 273 K) / (250 kPa * (25 + 273) K)
V2 ≈ 22.62 L
3. Suppose that an airplane flying 60 m/s, at a height of 300m, dropped a sack of flour (pere the effect
of air resistance). How far from the point of release would the sack have traveled when it stack the
ground?
The sack of flour would have traveled 468 meters from the point of release when it hits the ground, assuming no air resistance.
Explanation:The subject of your question is related to kinematic physics, particularly projectile motion. When the airplane drops the sack of flour, we need to separate the problem into vertical and horizontal components. The horizontal component is the initial speed of the airplane, which is 60 m/s, and the vertical component is influenced by gravity alone.
Before calculating how far from the point of release the sack would have traveled, we need to find the time it takes for the sack to hit the ground. Using the equation of motion for vertical motion (that is, ignoring air resistance) (h=1/2*gt², where h is the height, g is the acceleration due to gravity and t is time), we can find the time t. Substituting the given values, 300m = 1/2*9.8m/s²*t², we find that t is approximately 7.8 s.
The horizontal distance traveled by the sack is then obtained by multiplying the time t by the horizontal velocity of the airplane. That is, d = 60m/s * 7.8s = 468 m.
So, the sack of flour would have traveled 468 meters from the point of release when it hits the ground, assuming no air resistance.
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Which type of weather technology makes use of differences in temperature?
A
visible light satellites
B
doppler radar
C
barometer detectors
D
infrared imagery
The spectrum of infrared rays are used for the weather technology by observing the difference of temperature over specified area.
Answer : Option D
Explanation:
The infrared imagery or rather say infrared imaging is the spectral study of the infrared spectrum which is obtained by the sensors which read the certain parameters.
Here in weather technology, those sensors which are used to detect the signal or observations are scanning radiometers. The observation detected are the height of the cloud and their types. These infer in the calculation of temperature of surface water and the land.
Franny drew a diagram to compare images produced by concave and convex lenses.
Which belongs to the area marked in X?
Real
Virtual
Larger than object
Upside down
Answer:
B. virtual
Explanation:
Answer on edge 2020
Virtual is referred to the area which is marked as X and is denoted as option B.
What is a Virtual image?This is defined as an upright image which is formed where the rays seem to diverge.
Both concave and convex lenses produces a virtual image which was why it was chosen as the most appropriate choice.
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sort the phrases according to whether they belong in the category of permanent or temporary magnets
Permanent magnet:
Hard to demagnetize
Hard
Bar magnet
Temporary magnet:
Easy to demagnetize
Soft
Thumbtack
Answer:
Permanent magnet: Temporary magnet:
Hard to demagnetize Easy to demagnetize
Hard Soft
Bar magnet Thumbtack
What causes damage to the ozone layer?
Jenny has appealed to the local government to ban the use of aerosol room fresheners because they contain
, which can damage the ozone layer.
Answer:
Chlorofluorocarbons (CFC's)
Explanation:
The substances that are the most responsible for the damage done on the ozone layer are the chlorofluorocarbons (CFC's). The CFC's are very light, so they get up into the atmosphere with ease. While they are in the lower part of the atmosphere they do not cause any particular problems as the UV radiation is very limited, but that all changes when they reach the ozone layer. Once they reach the ozone layer in the stratosphere, the CFC's are exposed to much stronger UV radiation. This causes them to dissociate and release chlorine atoms. Once this has happened, these atoms manage to break down the bond between the oxygen atoms, thus destroying the ozone layer.
a truck moving 11.0 m/s makes a head-on inelastic collision with a stationary 1290 kg car. After, they move 8.75 m/s. what is the mass of the truck ?
Answer:
5017 kg
Explanation:
Since it is an inelastic collision, the truck and the car move together after the collision. The law of conservation of momentum states that the total momentum before and after the collision is conserved:
[tex]M u_t + m u_c = (M+m)v[/tex]
where
M is the mass of the truck
[tex]u_t = 11.0 m/s[/tex] is the velocity of the truck before the collision
m = 1290 kg is the mass of the car
[tex]u_c = 0[/tex] is the initial velocity of the car (stationary, so u=0)
v = 8.75 m/s is the final speed of the truck+car after the collision
Solving the equation for M, we can find the mass of the truck:
[tex]M u_t = Mv + mv\\M(u_t-v)=mv\\M=\frac{mv}{u_t -v}=\frac{(1290 kg)(8.75 m/s)}{11.0 m/s-8.75 m/s}=5017 kg[/tex]
Answer:
5017
Explanation:
I'm stuck with this question...pls help me
for first question
there are four engines .. each producing 250,000 N so total comes 4*250,000 N
is has weight 400,000 kg
thus Calculate it 4*250,000/400,000 gives you the answer
2nd question
after calculating acceleration from first part
apply it to the third equation of kinematics
v^2 = u^2 + 2asS.
where s is the distance required