The main difference between speed and velocity involves

Answers

Answer 1

Answer: Direction. Velocity is a vector that describes both speed and direction, while speed is a scalar that describes only speed regardless of direction.

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On a sky coaster (human pendulum) that reaches 20 meters from it's equilibrium position, a man of 70 kg is able to reach a maximum speed of
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In the series circuit below the power source is a 9-volt battery and three resistors are R1 = 7 ohm, R2 = 9 ohm and R3 = 2 ohm. What is the total resistance in the series circuit? R1 7 ohm + R2 9 ohm + R3 2 ohm = 18 Is this correct?
What does action force mean

How does size of an object affect its gravity

Answers

Answer:

the more particles packed together the faster it falls

Explanation:

the mass + the 1 constant g-force = the speed without adding air resistance

A Newton is 1 kgm/s^2 . Is this a fundamental unit or a derived unit?

Answers

The kilogram, the meter, and the second are the fundamental units.
When you mash them together in just the right way, the 'newton' is
derived from them.

Two skaters stand facing each other. One skater's mass is 60 kg, and the other'smass is 75 kg. The two skaters push off each other. After the push, the smaller
skater has a velocity of 3.0 m/s. If no other forces are acting on the skaters, what
is the velocity of the larger skater?

Answers

Answer:

v' = 2.4 m/s

Explanation:

Given that,

Mass of one skater, m = 60 kg

Mass of the other's skater, m' = 60 kg

The two skaters push off each other. After the push, the smaller skater has a velocity of 3.0 m/s.

When there is no external force acting on a system, the momentum remains conserved. It means initial momentum is equal to the final momentum. Let v' is the velocity of the larger skater.

mv = m'v'

$v'=(mv)/(m')\n\nv'=(60* 3)/(75)\n\nv'=2.4\ m/s$

So, the velocity of the larger skater is 2.4 m/s.

Final answer:

Considering the law of conservation of momentum, the velocity of the larger skater will be -2.4 m/s. The negative sign indicates the skater is moving in opposite direction.

Explanation:

This problem is solved using the principle of conservation of momentum, in physics. According to the law of conservation of momentum, the total momentum before the push is equal to the total momentum after the push. Initially, when the skaters are not moving, their total momentum is zero. After pushing off, their total momentum remains zero (They move in opposite directions thus one momentum is negative).

Momentum is the product of mass and velocity, symbolized as p=mv.

Let's say the velocity of the larger skater is 'v'. Momentum conservation gives us

60 kg * 3.0 m/s + 75 kg * v = 0

Solving, we find v = - 60 kg * 3.0 m/s / 75 kg = -2.4 m/s.

The negative sign simply indicates that the larger skater is moving in the opposite direction, but the magnitude of the velocity is 2.4 m/s.

Learn more about Conservation of Momentum here:

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A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

Answers

Answer: The kinetic energy of the ball at the maximum height is zero.

Explanation -

As per the question, the ball is moving vertically upwards. Every time it's velocity will decrease and it becomes zero at the maximum height.

Whole of ball's initial kinetic energy is converted into potential energy at maximum height.

Thus we can conclude that the kinetic energy is zero at the maximum height.

The maximum height is the point where the ball runs out of gas,
stops rising, starts falling, and it's velocity changes from upward
to downward. At that instant, it has no speed, so its kinetic energy
is zero.

Explain the difference between the following three substances: carbon c. , carbon dioxide (CO2), and oxygen (O2)

Answers

Carbon and oxygen are diatomic atoms. Carbon is made up of two elements.

Answer:

Carbon and oxygen are diatomic atoms. Carbon is made up of two elements.

Explanation:

You are sitting in a car that isn't moving; suddenly, the car quickly accelerates. your body seems to be pushed back against the seat. which word best explains why your body seemed to be pushed backward against the seat?

Answers

Explanation :

When the car accelerates, our body pushed backward against the seat. This effect is due to inertia.

When the car starts suddenly, our feet also comes in motion. But the rest body is still at rest.

Inertia is the property of a body which opposes its state of rest or state of motion.

In this case, the inertia of the passenger resists the motion of the car. So, he pushed backwards as the car started.

According to the Law of Inertia, our upper body was in rest and it wanted to remain in that condition.....

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