A 900-N lawn roller is to be pulled over a 5-cm (high) curb. Radius of roller is 25 cm. What minimum pulling force is needed if angle made by handle is (a) 0 deg (b) 30 degrees?

How many electrons are in an atom of copper?

Which of the following sequences correctly displays the energy transformation from the inside of a battery to the igniter inside a car's engine?

If a lamp has a resistance of 50 ohms and is operated by a p. d. of 10V, find the current flowing through it

A Blu-ray disk spins up from rest to an angular speed of about 10,000 revolutions per minute. If it can do this spin-up process in 2 seconds, what is its angular acceleration A. 20000 rev/s^2 B. 5,000 rev/s^2 C. 333 rev/s^2 D. 83 rev/s^2 E.

If the unit for force is f, the unit for velocity is v and the unit for time t, then the unit for momentum is

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)