Calculate the net work done to accelerate a 1500 kg car from 10m/s to 20m\s

Answers

Answer 1

Answer:
There are two ways to do this one.
In due consideration of 5 points, I have decided
to do it the easy way.

Kinetic energy = (1/2) (mass) (speed²)

The car's KE at the slower speed = (1/2 mass) x (10²)

   = 75,000 joules .

The car's KE at the faster speed = (1/2 mass) x (20²)

   =    300,000 joules .

The difference in kinetic energy between
the slower and faster speeds =

   (300,000 - 75,000) = 225,000 joules.

THAT's the work that had to be done in order to accelerate
the car to double the original speed.

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I need help I can't solve it and I'm struggling badly. Justin weighs 185 lb. and decides to climb a staircase that has a vertical distance of 12 m. He climbs the stairs in 12.7 seconds. Calculate his work:

A balloon drifts 140m toward the west in 45s ; then the wind suddenly changes and the balloon flies 90m toward the east in the next 25s. What distance did it travel during the first 45s?

Answers

Answer: 140 m

Explanation:

Let's begin by stating clear that motiont is the change of position of a body at a certain time. So, during this motion, the balloon will have a trajectory and a displacement, being both different:

The trajectory is the path followed by the body, the distance it travelled (is a scalar quantity).

The displacement is the distance in a straight line between the initial and final position (is a vector quantity).

So, according to this, the distance the balloon traveled during the first 45 s (its trajectory) is 140 m.

But, if we talk about displacement, we have to draw a straight line between the initial position of the balloon (point 0) to its final position (point 90 m). Being its displacement 95 m.

Emotional abuse is less harmful than physical abuse.
a. True
b. False

Answers

B) False
There is emerging evidence that emotional abuse is in fact, more harmful, than physical abuse. A study conducted by the Trauma Center at the Justice Resource Institute shows that because of the long-term nature of emotional and psychological abuse, victims score higher on a measure of a variety of negative risk factors and behaviors.

False, just because it's not physical, doesn't mean it's any less harmful than emotional.

A basketball player is 5.22 m from the goal when she shoots the ball at 10.0 m/s at a 65.0 degree angle. How much time does it take the hall to reach the horizontal position of the goal?