How did advances in technology open the way for world exploration?
Which wind system helped early sailors navigate earth's oceans?
The height of an average adult person is closest to
The global average height for an adult male is 171 centimeters (5 feet 7 inches) and the average height for an adult female is 159 centimeters (5 feet 2 inches).
What is the average height?It is important to note that these are just averages and there will be a range of heights within each country. For example, in the United States, the shortest 10% of men are less than 163 cm (5 ft 4 in) tall and the tallest 10% of men are more than 185 cm (6 ft 1 in) tall. The same is true for women.
The average height of an adult person has been increasing over time due to a number of factors, including improved nutrition and better healthcare.
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The mass of an object is independent of its location
a. True
b. False
An object with mass m is located halfway between an object of mass m and an object of mass 3m that are separated by a distance
d. what is the magnitude of the force on the object with mass m?
Leo placed two Circles of paper and a petri dish (something used for bacteria ) one Circle of paper was soaked in penicillin the other had nothing on it. He poured a liquid filled with bacteria into the Petri dish both Circles of paper were placed in The Petri dish about 3 cm apart at the end of the experiment a circle with a radius of 2 centimeters formed around the circle of paper soaked in penicillin there where no bacteria growing in the two centimeter Circle nothing had occurred around the other circle of paper the Victoria were going well.
a. what was the Dependant variable ?
b. what was the Dependant variable ?
c. what was the control group?
d. was there a controlled variable?
e. if yes, explain
Answer:
The independent variable is the variable in the experiment which can be manipulated or changed in an experiment, the effect of such change can be observed on the dependent variable. The dependent variable is the one which cannot be manipulated in the experiment and changes occurring in the dependent variable is because of affect of the changes in the independent variable. The control group is the group of the experimental study that does not receive treatment by the researchers. A control variable is the variable which remains constant and does not change in the experiment.
a. The dependent variable is the growth of bacteria.
b. The independent variable is the penicillin.
c. The control group is the paper circle which is not treated with penicillin.
d. The controlled variable is the paper not treated with penicillin.
e. The growth of bacteria is the dependent variable because it dependents upon the absence or presence of the penicillin. In the paper circle that lacks the penicillin shows the growth of bacteria and the paper circle socked with penicillin the growth of bacteria does not occur because it is an antibiotic which kills bacteria.
The penicillin is the independent variable because the effect of this can be observed on bacterial growth.
Which force puts an object into free fall?
Answer:
Gravity
Explanation:
When we say that object is in free fall then it always means that the object will move under the influence of gravitational force only
So here we can say that
under free fall condition the force on the object is given as
[tex]F = mg[/tex]
so the acceleration of free fall is always constant and given as
[tex]a = \frac{F}{m}[/tex]
[tex]a = \frac{mg}{m}[/tex]
[tex]a = g[/tex]
so correct answer is
Gravity
If weight is a measure of an object's force due to gravity, what is the weight of a student who has a mass of 65 kg? (assume that the acceleration due to gravity equals 9.8 m/s2.)
The weight of the object with mass 65kg and acceleration due to gravity 9.8 m/s² is 637N.
What is Weight?
The weight (w) of an object is the product of its mass (m) in kilograms and the acceleration due to gravity, g in meters per second square. The weight of an object in physics is the force which is acting on the object due to the gravity of the planet. The SI unit of weight is newton (N).
The weight of the object is:
W = m × g
where, W = weight of the object,
m = mass of the object,
g = acceleration due to gravity,
m = 65 kg,
g = 9.8m/s²
W = 65 × 9.8
W = 637N
Therefore, the weight of the object is 637N.
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1) mechanical
2) electrical
3) thermal
4) light
5) chemical
In the system, __________ energy from the sunlight causes the solar panel to create __________ energy which flows into the incandescent light bulb. In the light bulb, the ________ energy is transformed into two different types of energy: _________ energy and _________ energy.
The solar panel absorbs light energy and converts it into electrical energy. When this electrical energy reaches the incandescent light bulb, it is then transformed into thermal energy and light energy.
Explanation:In the system, light energy from the sunlight causes the solar panel to create electrical energy which flows into the incandescent light bulb. In the light bulb, the electrical energy is transformed into two different types of energy: thermal energy and light energy.
Firstly, the solar panel absorbs light energy, also known as solar energy, and through a process called photovoltaic effect, it transforms this energy into electrical energy. This electrical energy then travels into the incandescent light bulb. Within the bulb, this electric energy is converted into thermal (heat) energy - this is the reason why light bulbs can get very hot. The heat then produces light energy, which is what we ultimately see and perceive as the functioning of a light bulb.
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HELP ASAP!! DUE TOMORROW!! WILL MARK AS BRAINLIEST IF ANSWERED NOW!!
A car drives horizontally off the edge of a cliff that is 40.8 m high. the police at the scene of the accident note that the point of impact is 121 m from the base of the cliff. how fast was the car traveling when it drove off the cliff?
Final answer:
To calculate the speed of the car when it drove off the cliff, we used projectile motion equations to solve for the time it took to hit the ground and then found the horizontal velocity with this time and the given horizontal distance.
Explanation:
To determine the speed at which the car was traveling when it went off the cliff, we can use the kinematic equations for projectile motion. Given that the car falls from a height of 40.8 m and lands 121 m away from the base of the cliff, we can first calculate the time it took for the car to hit the ground using the equation for vertical motion under constant acceleration due to gravity (g = 9.8 m/s²). The vertical motion is independent of the horizontal motion, so:
y = ½ gt², where y is the vertical displacement and t is the time.
Using this equation, we solve for t:
40.8 m = ½ (9.8 m/s²) t²
t = √((2 * 40.8 m) / 9.8 m/s²)
After calculating the time, t, we can then use the horizontal distance travelled and the time of flight to find the horizontal velocity (v):
x = v * t, where x is the horizontal displacement.
Now we substitute the previously calculated time t in the equation to find the horizontal velocity (which is also the initial velocity since there is no horizontal acceleration):
v = x / t
v = 121 m / t
This gives us the car's speed as it left the cliff.
what is the difference between ram express and tradesman
What social science, which deals with the behavior and thinking of organisms, differs from sociology primarily in that it focuses on individual behavior rather than on group behavior?
Answer : The correct answer is- Psychology.
As per the American Psychological Association, psychology can be described as the scientific study of mind and behavior of a particular individual.
There are primarily four goals of psychology that are to describe, to explain, to predict, and to control the mental processes as well behavior of a person.
On the contrary, sociology focuses on behaviour of group of individuals. It is the study of structure, function as well as development of society.
Thus, psychology is the right answer to the question.
What is the wavelength of an infrared wave with a frequency of 4.2 x1014 Hz?
The wavelength of an infrared wave with a given frequency is 7.14 x 10⁻⁵ m.
What is frequency?Frequency is the number of cycles per second moved by the wave.
The frequency and wavelength is related as
λ = c/f
where c = velocity of sound wave in vacuum = 3×10⁸ m/s
Given is the frequency of the infrared wave f = 4.2×10^14, then wavelength will be
λ = 3 x10⁸ / 4.2 x 1
λ = 7.14 x 10⁻⁵ m
Thus, the wavelength of an infrared wave with a given frequency is 7.14 x 10⁻⁵ m
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How do the base pairing rules relate to chargaff's rule?
Final answer:
Chargaff's rule, which states that in DNA, the amount of adenine equals thymine and guanine equals cytosine, directly supports the base pairing rules necessary for DNA's double helix structure and its replication.
Explanation:
The base pairing rules and Chargaff's rule are intimately connected in explaining the structure and function of DNA. Erwin Chargaff discovered that in any given DNA molecule, the amount of adenine (A) is approximately equal to thymine (T), and the amount of guanine (G) is approximately equal to cytosine (C). This observation is now known as Chargaff's rule. It was a pivotal finding that helped James Watson and Francis Crick determine the double helix structure of DNA.
They uncovered that A pairs with T through two hydrogen bonds, and G pairs with C through three hydrogen bonds, adhering to the base pairing rules. This complementary base pairing ensures that DNA can replicate and transfer genetic information accurately.
If the position of an object is zero at one instant, what is true about the velocity of that object?
If the position of an object is zero at one instant, then its acceleration must also be zero at the same location.
What is velocity and Acceleration?The velocity of an object is the pace at which its location or displacement changes over time. The vector quantity known as velocity has a direction determined by the force's direction.
There are various types of velocity :
Uniform VelocityNonuniform velocityInstantaneous velocityAverage Velocity.The rate at which an object's velocity changes with respect to time is known as acceleration. Vector quantities are used to measure accelerations.
Velocity is the ratio of displacement to time similarly acceleration is the ratio of change in velocity to time so, if velocity of an object is zero then its acceleration also must be zero.
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A car accelerates from rest to a speed of 8 m/s over a distance of 16 m. What is the acceleration of the car?
A.-10 m/s2
B.-2 m/s2
C. 2 m/s2
D.no acceleration, v = 8 m/s
The acceleration of the car is 2 m/s². Hence, option (C) is correct answer.
What is acceleration?Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.
Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.
Given parameters:
Initial speed pf the car: u = 0 m/s.
Final speed of the car: v = 8 m/s.
Distance travelled: s = 16 m.
We have to find: the acceleration of the car: a = ?
Now, from v² = u² + 2as equation, we can write:
8²= 0² + 2×a×16
a = 2 m/s²
Hence, The acceleration of the car is 2 m/s² & option (C) is correct answer.
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A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.00 m above. the brother’s outstretched hand catches the keys 1.50 s later. (a) with what initial velocity were the keys thrown? (b) what was the velocity of the keys just before they were caught?
Explain how the position of the moon relates to the occurrence of high tides and low tides?
You run 100 meters in 15 seconds. What is your speed in m/s?
Which of the following is an organic compound?
Answer:
D
Explanation:
In order to be classified as an organic compound, the compound must contain carbon. Of the options available, only option D includes a sample that contains carbon.
Organic compounds often contain C, H, and O atoms, such as ethanol, CH₃OH.
A ball is tossed straight up with an initial velocity of 13.6 m/s. A) how high will it go? B) how long is the ball in the air?
Bob is pulling a 30 kg filing cabinet with a force of 200 n, but the filing cabinet refuses to move. the coefficient of static friction between the filing cabinet and the floor is 0.80. what is the magnitude of the friction force on the filing cabinet?
Final answer:
The magnitude of the friction force opposing the filing cabinet is 200 N, equal to the applied force, since it does not exceed the maximum static frictional force of 235.2 N calculated using the coefficient of static friction and the normal force.
Explanation:
The magnitude of the friction force on the filing cabinet can be determined by using the coefficient of static friction and the normal force acting on the cabinet. Since the cabinet is not moving, the static frictional force will be equal to the force applied until it reaches its maximum value, which can be calculated as μs N, where μs is the coefficient of static friction and N is the normal force. The normal force is equal to the weight of the cabinet (mass times the acceleration due to gravity, g). For a 30 kg filing cabinet, the normal force N is equal to 30 kg × 9.8 m/s², which equals 294 N. Hence, the maximum static frictional force is 0.80 × 294 N = 235.2 N. Since the cabinet does not move when a 200 N force is applied, the frictional force opposing it is also 200 N, which is less than the maximum static friction of 235.2 N.
Final answer:
The friction force on the filing cabinet is 200 N, which is the same as the applied force and within the maximum static friction value given by the coefficient of static friction multiplied by the normal force.
Explanation:
The magnitude of the friction force on the filing cabinet can be found by using the coefficient of static friction and the normal force. The normal force is equal to the weight of the cabinet, which is the mass (30 kg) multiplied by the acceleration due to gravity (9.8 m/s²). This gives a normal force of (30 kg)(9.8 m/s²) = 294 N. The maximum static friction force can be calculated with the formula fs(max) = μs N, where μs is the coefficient of static friction and N is the normal force. Since the cabinet doesn't move, the static friction force must equal the applied force up to its maximum value, which is determined by the coefficient of static friction (0.80).
Therefore, the maximum static friction force that can act on the filing cabinet is fs(max) = (0.80)(294 N) = 235.2 N. Since 200 N is being applied to move the cabinet, and it does not move, the friction force acting on the cabinet is 200 N, which is the same as the applied force and less than the maximum static friction force.
In an experiment, you find the mass of a cart to be 250 grams. What is the mass of the cart in kilograms?
In an experiment, you find the mass of a cart to be 250 grams, then the mass of the cart in kilograms would be 0.25 kilograms.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
Any additional quantity of that type can be stated as a multiple of the measurement unit.
As given in the problem experiment, you find the mass of a cart to be 250 grams, then you have to convert its value into kilograms,
1000 grams = 1 kilogram
1 gram = 1/1000 kilograms
250 grams = 250/1000 kilograms
= 0.25 kilograms
Thus, the mass of the cart in kilograms would be 0.25 kilograms
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A man weighs 1190 n on earth. what would he weigh on jupiter, where the free-fall acceleration is 25.9 m/s 2 ? the acceleration of gravity is 9.8 m/s 2 . answer in units of n.
The weight on Jupiter of a man if man weighs 1190 N on earth. Where the free-fall acceleration is 25.9 m / s² is 3144.26 N.
What is acceleration?Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration of all other motions.
Given:
The weight of the man, F = 1190 N,
The acceleration, a = 25.9 m / s²,
Calculate the mass of the man by the formula given below,
[tex]F = ma[/tex]
1190 = m × 9.8 m / s²
m = 121.4 kg
Calculate the weight of a man on Jupiter by the formula given below,
[tex]F = ma[/tex]
F = 121.4 × 25.9
F = 3144.26 N
Therefore, the weight on Jupiter of a man if man weighs 1190 n on earth. Where the free-fall acceleration is 25.9 m / s² is 3144.26 N.
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A ball is thrown straight up from the ground with an unknown velocity. It reaches its highest point after 3.5 s. With what velocity did it leave the ground?
Answer:
0.295 m
Explanation:
Velocity of the wave= 1.3Kms-1= 1300ms-1
Frequency of the wave= 4.4MHz= 4400Hz
From
Velocity= wavelength × frequency
Wavelength= velocity/frequency
= 1300/4400
=0.295 m
hope this helps :)
A jogger runs the first 1000 meters of a race in 250 seconds. What is the joggers speed
Answer:
The speed of the joggers is 4 m/s.
Explanation:
Given that,
Distance covered by the joggers, d = 1000 meters
Time taken by the joggers, t = 250 seconds
We need to find the joggers speed. It is given by :
[tex]v=\dfrac{d}{t}[/tex]
[tex]v=\dfrac{1000\ m}{250\ s}[/tex]
v = 4 m/s
So, the joggers speed is 4 m/s. Hence, this is the required solution.
A cyclist start at rest and accelerate at 0.5m/s square south for 20 s .what is the cyclists final velocity?
If a cyclist starts at rest and accelerates at 0.5 m/s² south for 20 seconds, then the final velocity of the cyclist would be 10 meters/second.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
As given in the problem if a cyclist starts at rest and accelerates at 0.5 meters / second² south for 20 seconds,
By using newton's first equation of the motion for the first car.
v = u +at
v = 0 + 0.5 ×20
v = 10 meters / second
Thus, the final velocity of the cyclist would be 10 meters/second.
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A 36,287 kg truck has a momentum of 907,175 kg • . What is the truck’s velocity?
What is the least possible initial kinetic energy in the oxygen atom could have and still excite the cesium atom?
The minimum kinetic energy needed to excite a cesium atom by a collision with an oxygen atom can be calculated using the conservation of energy principle.
Explanation:The minimum amount of kinetic energy a particle must have to excite another particle can be calculated using the conservation of energy principle and the equation for kinetic energy. In this case, we are considering the collision between an oxygen atom (O) and a cesium atom (Cs). The formula for calculating the minimum kinetic energy is:
K.E. = (2 * activation energy) + ionization energy
The activation energy is the minimum energy required to initiate the reaction, and the ionization energy is the energy required to remove an electron from an atom. To calculate the specific values for this equation, we need to know the activation energy and the ionization energy of the cesium atom.
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