Which type of friction keeps a pile of rocks from falling apart?

4) Electric nature of lightning was established by (a) Robert Hook (b) Isaac Newton (c) Benjamin Franklin (d) Robert Koch

Which is true about the total mechanical energy of a pendulum in the absence of friction? 1. It exhibits constant velocity motion. 2. It exhibits simple harmonic motion. 3. It exhibits circular motion. 4. It exhibits only upward motion.

Monochromatic light is incident on a grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light? 202 nm 605 nm 806 nm 403 nm 452 nm

What is one difference between a total solar and a total lunar eclipse? Question 4 options: A-In a solar eclipse, the sun moves between Earth and the moon. In a lunar eclipse, the moon moves between the sun and Earth.

What are some examples of pressure

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.

A few years ago, Serena Williams dived to hit a tennis ball right after it bounced off the ground. The ball bounced on the ground 10.3 m from the net, and after Serena hit the ball it flew over the 0.

A force of 1.25x103N is required to lift an object that is under the influence of an acceleration due to gravity of 7.86ft/sec2. What is the object's mass in kilograms?