The velocity of a 40 kg object increases from 20 m/s to 30 m/s in 2 seconds. What is the acceleration of the object during these 2 seconds

An engine whose sparkplugs fire 120 times a second generates noise at 120 Hz. The sound level can be reduced by fitting the engine with an exhaust resonator that cancels this primary "note.

A laser pulse with wavelength 520 nm contains 4.40 mj of energy. how many photons are in the laser pulse?

During the first 42 s a truck traveled at a constant speed of 8.0 m/s. Find the distance it traveled in meters. [Give answer to one decimal place; do not include units]

Why can parallax only be used to measure distances to stars that are relatively close to earth?

What is electromagnetic induction?

What is the potential energy called that is associated with objects that can be stretched

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a

What is Nothing. (sorry i have been wondering this for a very long time)