if the coolant in a refrigerator was not compressed back into a liquid after it flowed through the refrigerator what would happen
Less heat would be removed from the refrigerator.
a weightlifter liftsa 1,250-N barbell 2 m in 3 s. how much power was used to lift the barbell?
The weightlifter used approximately 833.33 Watts of power to lift the barbell.
To calculate the power used by the weightlifter to lift the barbell, we need to first determine the work done and then divide it by the time taken to do this work. Power is defined as work done per unit time.
The work ( W ) done when lifting the barbell can be calculated using the formula W = force (F) x distance (d). In this case, the force is equal to the weight of the barbell (1,250 N) and the distance is 2 meters, so the work done would be:
W = F x d = 1,250 N x 2 m = 2,500 Joules
Now, the power ( P) can be calculated using the formula P = W / time ( t). The time taken to lift the barbell is 3 seconds, so:
P = W / t = 2,500 J / 3 s = 833.33 Watts
Therefore, the weightlifter used approximately 833.33 Watts of power to lift the barbell.
The space shuttle travels at about 28,000 km per hour. Using that information, estimate how many hours it will take the shuttle to reach Saturn from Earth. Show your work. Convert your answer into scientific notation if necessary.
find the velocity of an object dropped from a height of 300 m at the moment it hits the ground?
The velocity of an object dropped from a height of 300m at the moment it hits the ground is approximately 77.46 m/s.
Explanation:The subject of the question is on kinematics under gravity, also referred to as free-fall motion. Here, you are asked to find the velocity of an object just before it hits the ground, having dropped from a height of 300m.
We can use the equation of motion for this operation: v² = u² + 2gH, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity (approx 9.8 m/s²) and H is height. In this case, the object is dropped, meaning its initial velocity (u) is zero. Substituting the values, we have v² = 0 + 2*9.8*300. Solving this, we get v = sqrt(2*9.8*300) = 77.46 m/s (approx). This is the velocity of the object at the moment it hits the ground when it is dropped from a height of 300 m.
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The amount of water vapor in the air is known as the
Which of the following represents the greatest speed? 40 m/s 400 cm/s 0.4 km/s 40,000 mm/s
Answer:
0.4km/s
Explanation:
To be able to know the greatest speed out of all the speed values, we will have to convert the velocities value to m/s.
Converting velocity of 400cm/s to m/s, we have;
400cm/s × 1m/100cm
= 4m/s
Since 100cm = 1m
For velocity of 0.4km/s, we have;
0.4km/s × 1000m/1km
= 400m/s
Note that 1000m = 1km
For velocity 40,000mm/s, we have;
40,000mm/s× 1m/1000mm
= 40m/s
Since 1000mm = 1m
Therefore among all the converted values, the velocity of 0.4km/s which is equivalent to 400m/s is the greatest.
An arrow is shot vertically upward at a velocity of 50.0 m/s. what was its velocity after 2.00 seconds?
Is it possible to travel a great distance without any displacement? Prove your answer.
Answer: Yes
Explanation: The definition of displacement is the change on the position, So if i start in my home, then i go to the mall, and after that i return home, the total displacement over that period of time is 0, because i started in my house and ended in my house. But in that proces i traveled the distance between my house and the mall two times. So is possible to travel great distances without any displacement, only if the endpoint of the travel is the same as the start point.
What are gamma rays? How are they used?
Answer:
Gamma rays and its uses are discussed below.
Explanation:
Characteristics of Gamma rays
Radiation of short wavelength and high frequency.Gamma rays do not deflect in a magnetic field.Gamma rays have strong penetration energyUses of Gamma rays
Medical: Gamma rays are used as a medicine to kill the carcinogens cells and prevent them to grow again.Industrial: Gamma rays are used in the industry to check the oil pipeline and discover the weak points.
The amount of a light a star gives off is called___?
What causes an electric charge?
Question 1 options:
The movement of electrons due to a difference in electric potential energy
The movement of protons due to a difference in electric potential energy
The movement of neutrons due to a waterfall
The movement of electrons due to kinetic energy
The movement of electrons due to a difference in electric potential energy is the electric charge.
The movement of protons due to difference in the electric potential is not the definition of potential energy. The movement of the neutrons as a result of waterfall is also not the electric charge. The movement of electrons because of kinetic energy is also not the electric charge. The electric charge can be defined as the movement of the electrons from one direction to another as a result it causes a development of potential difference resulting in development of potential energy. Hence, the movement of electrons due to a difference in electric potential energy is the electric charge is the correct option.Learn more about electric charge:
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How are atoms in a magnet arranged?
A. according to their magnetic poles
B. according to their magnetic force
C. according to their magnetic properties
D. according to their magnetic areas
Electrostatic forces hold which of the following together?
Cu atoms and localized electrons in copper
K+ and Br in KBr
He atoms in helium gas
oxygen and hydrogen atoms in OH
What kind of marker is required on farm equipment traveling less than 25 mph?
A 10-newton force is applied to a 2-kg block. The block slides across the floor at a constant speed of 5 m/s. What is a valid conclusion from this situation?
Final answer:
When a 10-newton force is applied to a 2-kg block and the block slides across the floor at a constant speed of 5 m/s, we can conclude that the applied force is balanced by the frictional force acting on the block.
Explanation:
From the given information, we can conclude that the applied 10-newton force is balanced by the frictional force acting on the block. This is because the block slides at a constant speed of 5 m/s, indicating that the net force on the block is zero. The frictional force is equal in magnitude and opposite in direction to the applied force. Therefore, we can infer that the magnitude of the frictional force is also 10 newtons. This situation demonstrates Newton's first law of motion, which states that an object will remain at rest or move with constant velocity unless acted upon by an external force.
The motion of a girl riding a farris wheel is called
TRUE or FALSE: Isaac Newton discovered that the color white is created when light passes through a prism.
Increasing the mass attached to a spring will increase its vibrational period.
True or false? ...?
A bird flies from the South Pole to the North Pole. Part of the journey is 1000 miles that takes 2 weeks. What is the bird’s velocity in that time? Show work for credit and include final units. help please
The correct answer to the question is : 2.976 miles/hour.
CALCULATION:
As per the question, the distance travelled by the bird X = 1000 miles.
The time taken by the bird to cover that distance t = 2 weeks.
= 2 × 7× 24 hours
= 336 hours
We are asked to calculate the speed of the bird.
The speed of the bird is calculated as -
speed v = [tex]\frac{distance}{time}[/tex]
= [tex]\frac{1000}{336}\ miles/hour[/tex]
= 2.976 miles/hour [ans]
Hence, the velocity of the bird is 2.976 miles/hour.
A 1430 kg car speeds up from 7.5 m/s to 11 m/s in 9.3 s. Ignoring friction, how much power did that require?
An air bubble at the bottom of a lake 43.5m deep has a volume of 1.00cm/cubed. If the temperature at the bottom is 5.5 degrees celcius and at the top 21.0 degrees celcius, what is the volume of the bubble just before it reaches the surface.
...?
The answer is 15.0 mL
All of the following describe climate except
it is hot today
the average temperature of a place
the average precipitation of a place
the average number of sunny days of a place
Which statement is true because of Newton's second law?
A)when the net force on an object decreases, the objects acceleration increases.
B)When the net force on an object increases,the objects acceleration decreases.
c)When the net force on an object decreases,the acceleration doesn't change.
D)When the net on an object decreases,the object's acceleration decreases.
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A car is traveling at a constant velocity of 60 km/h for 4 hours.
Choose the correct statement about the acceleration of the car.
A) The acceleration of this car is zero.
B) The acceleration of this car is positive.
C) The acceleration of this car is negative.
D) The acceleration of this car is 15 m/s.
A student hangs a mass of 150 g on a force table at an angle of 150 degrees . If she then hangs a mass of 220 g at 270 degrees.
A) at what angle should she hang a mass of 195 g so that the ring is in equilibrium?
B) Draw the vectors
Suppose the sun shrank in size but its mass remained the same. what would happen to the orbit of earth?
If the sun shrank in size but its mass remained the same, the Earth's orbit around the Sun would remain unchanged. This is due to the fact that it's the Sun's mass, not its size, that mainly determines the strength of its gravitational pull on Earth.
Explanation:If the sun were to shrink in size but maintain the same mass, the gravitational pull it exerts on the Earth would remain the same. This is based on Newton's law of universal gravitation, which states that two bodies attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Therefore, if the sun's mass is unchanged, the Earth's orbit would remain unchanged as well because it is the sun's mass (not its size) that principally determines the strength of its gravitational pull on the Earth.
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Work is equal to _____.
force times size
velocity times force
distance times force
Answer : The correct option is, distance times force
Explanation :
Work : It is defined as the force acting on an object to cause a displacement. Or we can defined as the work is equal to the product of the force of an object and displacement of an object.
The formula of the work is written as,
[tex]W=F\times d[/tex]
where,
W = work done
F = force applied on an object
d = displacement of an object
Hence, the work is equal to distance times force.
Work is equal to distance times force in Physics. The force must be directly causing motion of the object for work to be calculated. For instance, pushing a box 5 meters with a force of 10 Newtons would result in 50 Joules of work.
Explanation:In the field of Physics, work is defined as the force applied on an object times the distance that the object moves. In other words, work is equal to the product of distance times force. The force must be causing the object to move in the direction of the force in order for work to happen. For example, if you push a box 5 meters with a force of 10 Newtons, the work done would be 50 Joules (10 Newtons x 5 meters).
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Lightning is an example of matter in a liquid state.
True
False
i am trying recheck my answers before i do i finish my home work so if i post a lot of questions i am srry ...?
Answer:
False
Explanation: Lightening is not an example of matter in solid or liquid state. It is a phenomenon of spark of electricity in the atmosphere. Lightening can also be seen in volcanic eruptions,forest fires, thunderstorms, hurricanes etc. In the initial stage of development of lightening air acts as an insulator between positive and negative charge but when charge develops enough it break the wall of insulator air and sparking occurs.
Women in the United States have 10 hours more leisure time per week than men.
Please select the best answer from the choices provided
T F
Egenuity says the answer is False ^-^
Answer: The given statement is false.
Explanation:
In the United states, both men and women are treated equally and like men, women also work for living.
Also women has the responsibility to do house hold chores so most of the time women are busy with their family or work. Hence, they do not get enough leisure time.
Therefore, the statement women in the United States have 10 hours more leisure time per week than men, is false.
A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?
A) the wood
B) the iron
C) Both have the same buoyant force.
D) The answer cannot be determined without knowing the densities of the blocks.
Answer: Option A
Explanation: The buoyant force depends on the amount of displaced fluid (in this case water)
As the wood is less dense than the iron, the wood requires a lot less upwards force to float, and it only displaces a little bit of fluid, in the other case, the iron requires a lot more of force to do it, so it displaces a lot of water and is totally submerged, and the iron block can never float actually, so it sinks down, at the point that the buoyant force applied is negative (the weight of the water upside the block is bigger than the force upwards)
The Buoyant force can be calculated as:
B = weight on-air - weight on water.
The block of wood is floating, so the weight on the water is zero, and the buoyant force is equal to his weight in the air.
For the block of iron, we have:
B = Weight on-air - weight on water, here in both cases we have positive numbers, but not enough information to know them.
Then the only information that we have is that the woodblock displaces less water than the other block, so with this, we only can know that the buoyant force in the woodblock is smaller.