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3 years ago

The main difference between speed and velocity involves

Physics

2 answers:

mezya [45]3 years ago

4 0

The main difference between speed and velocity is A: direction.

vodomira [7]3 years ago

3 0

The Correct answer to this question for Penn Foster Students is: Direction

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A force F making an angle ø with the horizontal is acting on an object resting on the table. Which statement is true for the mot

Viktor [21]

The statement that is true for the motion of sliding the object on the table is : its independent of all forces acting on the object

The only thing that it depend on is the forces acting along both the x-axis and the y-axis.

hope this helps

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4 years ago

A car is raised on a lift at a service station (so it has some amount of gravitational potential energy relative to the ground).

kenny6666 [7]

Answer:Twice

Explanation:

It is given that car is raised on a lift with respect to ground.

Suppose car is raised by a height of h m from ground having mass m so gain in Potential Energy by car is

Gain in $P.E._1=m\times g\times h$

Now if it were raised twice as high,i.e. 2 h height from ground then gain in Gravitational Potential Energy

$=m\times g\times 2h$

$P.E._2=2m\cdot g\cdot h$

It is clear that $P.E._2=2\cdot P.E._1$

Thus in second case gain in Potential Energy is twice as compared to first case

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4 years ago

_____ is very corrosive and can cause rusting so metal tanks shouldn't be used

bagirrra123 [75]

Answer:

Iron

Explanation:

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3 years ago

The illustration above depicts a spring being compressed and then released. Changes in both potential and kinetic energy occur d

erik [133]

the potential energy is increasing through steps A & B, then decreases at C.

3 0

3 years ago

Read 2 more answers

Two balls with equal masses, m, and equal speed, v, engage in a head on elastic collision. what is the final velocity of each ba

Allushta [10]

The collision is elastic. This means that both momentum and kinetic energy are conserved after the collision.

- Let's start with conservation of momentum. The initial momentum of the total system is the sum of the momenta of the two balls, but we should put a negative sign in front of the velocity of the second ball, because it travels in the opposite direction of ball 1. So ball 1 has mass m and speed v, while ball 2 has mass m and speed -v:
$p_i = p_1-p_2 = mv-mv =0$
So, the final momentum must be zero as well:
$p_f = 0$
Calling v1 and v2 the velocities of the two balls after the collision, the final momentum can be written as
$p_f = mv_1 + mv_2 = 0$
From which
$v_1 = -v_2$

- So now let's apply conservation of kinetic energy. The kinetic energy of each ball is $\frac{1}{2} mv^2$ . Therefore, the total kinetic energy before the collision is
$K_i = \frac{1}{2} mv^2 + \frac{1}{2} mv^2 = mv^2$
the kinetic energy after the collision must be conserved, and therefore must be equal to this value:
$K_f = K_i = mv^2$ (1)
But the final kinetic energy, Kf, is also
$K_f = \frac{1}{2} mv_1^2 + \frac{1}{2}mv_2^2$
Substituting $v_1 = -v_2$ as we found in the conservation of momentum, this becomes
$K_f = mv_2 ^2$
we also said that Kf must be equal to the initial kinetic energy (1), therefore we can write
$mv_2^2 = mv^2$

Therefore, the two final speeds of the balls are
$v_2 = v$
$v_1 = -v_2 = -v$

This means that after the collision, the two balls have same velocity v, but they go in the opposite direction with respect to their original direction.

8 0

3 years ago