Cracking the SAT Physics Subject Test

...

THE WORK–ENERGY THEOREM Kinetic energy is expressed in joules just like work, since W = K, as in the case we just saw. In fact, ...

kinetic energy? Here’s How to Crack It To stop an object means to change its kinetic energy to zero. So, if the initial kinetic ...

Here’s How to Crack It The kinetic energy of the ball as it leaves the cue is K = mv^2 = (0.25 kg)(2 m/s)^2 = 0.5 J The work W d ...

POTENTIAL ENERGY Kinetic energy is the energy an object has by virtue of its motion, but potential energy is independent of moti ...

Notice that potential energy, like work (and kinetic energy), is expressed in joules. In general, if an object of mass m is rais ...

Ugrav = mgh = (60 kg)(10 N/kg)(20 m) = 12,000 J ...

CONSERVATION OF MECHANICAL ENERGY We have seen energy in its two basic forms: kinetic energy (K) and potential energy (U). The s ...

What can you say about the calculated total mechanical energy at each stage? The correct answer is that it’s always the same. An ...

A ball of mass 2 kg is gently pushed off the edge of a tabletop that is 1.8 m above the floor. Find the speed of the ball as it ...

ramp is very smooth (essentially frictionless), how high up the ramp will the box go? What distance along the ramp will it slide ...

Since the incline angle is θ = 30°, the distance, d, it slides up the ramp is found in the following way. ...

Wile E. Coyote (mass = 40 kg) falls off a 50-meter-high cliff. On the way down, the force of air resistance has an average stre ...

Find an expression for the minimum speed at which an object of mass m must be launched in order to escape Earth’s gravitational ...

...

POWER Simply put, power is the rate at which work is done (or energy is transferred, which is the same thing). Suppose you and I ...

...

Chapter 4 Comprehensive Drill See Chapter 17 for solutions. A vertical force F of strength 20 N acts on an object of mass 3 kg ...

what is its speed at the bottom? (A) 5 m/s (B) 6 m/s (C) 8 m/s (D) 9 m/s (E) Cannot be determined from the information given A ...

(E) A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is ...