A bar on a hinge starts from rest and rotates with an angular acceleration α = 15+4t, where α is in rad/s2 and t is in seconds. Determine the angle in degrees through which the bar turns in the first 2.00 min.

Noise reduction headphones actively produce their own sound waves in order to cancel out external sound waves. A microphone in the headphones receives waves of one frequency.

Joy is drinking a cup of water in her mom's car. As her mom stops the car at a red light, Joy's water spills. How can this be explained in terms of inertia?

An impala is an African antelope capable of a remarkable vertical leaf. In one recorded leap, a 45 kg impala went into a deep crouch, pushed straight up for 0.21 s, and reached a height of 2.5 m above the ground.

Your shadow follows you everywhere. How is it formed? Is it always the same size or shape? Do you always have one shadow?

Select all that apply. Which statements are supported by the second law of thermodynamics? The usable energy in the universe is decreasing. The usable energy in the universe is increasing. The energy of the universe is being destroyed.

Consider a helium balloon on a string tied to the seat of your stationary car. The windows are closed, so there is no air motion within the car. The car begins to accelerate forward. Which way will the balloon lean, forward or backward

The force of gravity acts upon meteors from the rocky asteroid belt between mars and Jupiter. Where is the force of gravity most likely to pull these meteors

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. Which of the following best describes how such a telephone is able to transmit and receive information? A.

Calculate the gravitational potential energy relative to the ground when an 82 kg person climbs to the top of a 2.0 m stepladder.

A rock is thrown from a cliff and hits the ground five seconds later at a distance of 50 m from the cliff how high was a cliff