Which a vector quantity: speed or velocity?

Answers

Answer 1

Answer: Velocity is the vector. It has both size and direction.
Speed is a scalar. It has only size.

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12. Which of the following can be calculated if the length of the effort arm and the length of the resistance arm are given? (Points : 3)the mechanical advantage of a lever can be calculated.
the mechanical advantage of a wheel and axle can be calculated.
the mechanical advantage of a pulley can be calculated.
the mechanical advantage of a wedge can be calculated.

Answers

The best and most correct answer among the choices provided by your question is the first choice or letter A.

The mechanical advantage of a lever can be calculated if the length of the effort arm and the length of the resistance arm are given.

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Answer:

The mechanical advantage of a lever can be calculated.

Explanation:

If the length of the effort arm and the length of the resistance arm are given we can calculated the mechanical advantage of a lever. It is also defined as the ratio of output force to the input force. Mathematically, it is given by :

$MA=(F_o)/(F_i)$

Where

$F_o$ is the output force

$F_i$ is the input force

A lever is a simple machine in which there is a Plank that is free to free to rotate around a pivot. So, the correct option is (a) "the mechanical advantage of a lever can be calculated".

The force of gravity acting on a child's mass on earth is 490 newtons. Whats the child's mass?A. 206 kg
B. 800 kg
C. 50 kg
D. 4802 kg

Answers

Force of gravity on an object is the weight of the object and is given by mass times accerelation due to gravity. The accerelation due to gravity is the accerelation of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtns, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

Answer:

C. 50 kg

Explanation:

Force of gravity on an object is the weight of the object and is given by mass times acceleration due to gravity. The acceleration due to gravity is the acceleration of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtons, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

An automobile engine exerts aforce of 595 N to propel the car at 90.0 km/h on a level road. What is the power output of the engine at
that time?

Answers

It's exactly enough to replace the energy lost to friction and air resistance. We have no information with which to evaluate those. Without friction and other losses, it takes no force and no power to keep a car moving at any speed in a straight line.

the power would be 595*90=53550w

How far is it to the stars

Answers

The closest is the sun. The next star is 4.3 light years away

The distance to every star is different. The nearest star is the sun. That's 93 million miles away. The next nearest star is a little over four light-years away. From there they range out to 13 billion light-years. There are more past that but we can't see any farther.

In 3 seconds, a wave generator produces 15 pulses that spread over a distance of 45 centimeters. Calculate its velocity._____ cm/s

45

15

5.0

3.0

Answers

your answer is 45 because you would do 15*3 then that will get you 45

Answer:

no its 15 you guys

Explanation:

How does molecules move in Hot and cold air?

Answers

Answer:

In cold air, the molecules mover slower because of the colder tempature, however, in hot air they move faster this is because the molecules are being heated up. Hot = faster, cold = slower

Explanation:

Other Questions

Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulley is helping him. How is the pulley helping Adam lift the object?a. All of these answers are correct. b. A fixed pulley lowers the amount of force needed to do the same amount of work. c. A fixed pulley increases the distance over which the force is applied. d. A fixed pulley helps Adam change the direction of the effort force.

Which of the following is an example of a measurement of velocity?a. 1 m b. 1 m/s c. 1 m/s² d. 1 m/s north

Which of the following terms describes the motion of particles during the transmission of wave energy?

How would you characterize the flame test with respect to its sensitivity