What are some other examples of a force acting on an object without

touching it?

If the decomposition of hydrogen peroxide is a first order reaction and it takes 20.0 minutes for the initial concentration to fall from 1.6M to 0.80M, how much time has passed when only 0.050M remain a) 80 min b) 120 min c) 100 min d) 40 min

High power laser has a beam diameter of 1 mm and generates an electric field with an amplitude of 0.9 MV/m at the target. Find the average power of the laser. a) 511 W b) 845 W c) 700 W d) 667 W e) 1040 W

The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called a. contact charging. c. polarization b. induction. d. neutralization.

The aurora is caused by high natural currents flowing in: a) the inosphere b) the upper clouds c) outer space d) the asthenosphere

A 1 kg ball is dropped from the top of a cliff and falls with a constant acceleration due to gravity (9.8 m/s2). Assume that effects of air resistance can be ignored. a.

What is the rate at which energy is transferred?

A person is strolling along a moving walkway at a constant velocity of + 1.00 m/s with respect tot he walkway, which moves at a constant velocity of + 0.50 m/s with respect to the ground.

Unbalanced forces can cause an object to do three things. What are they?

For the merry-go-round problem, do the magnitudes of the position, velocity, and acceleration vectors change with time?

What temperature scale (s) are used most often by scientists? a. only celsius b. celsius and kelvin c. fahrenheit and kelvind. fahrenheit and celsius