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?

Leo placed two Circles of paper and a petri dish (something used for bacteria) one Circle of paper was soaked in penicillin the other had nothing on it.

Mustang Sally just finished restoring her 1965 Ford Mustang car. To save money, she did not get a new battery. When she tries to start the car, she discovers that the battery is dead and she needs a jump start.

What is 18,000 expressed in scientific notation? 1.8 * 10-4 1.8 * 104 1.8 * 10-5 1.8 * 105

A galaxy that was once a quasar is likely to A) have burned all its fuel by now and be dark. B) now be a dwarf irregular. C) have a black hole at its nucleus. D) still be a quasar. E) be less than 5 billion years old.

A mass on a spring vibrates horizontally on a smooth level surface. its equation of motion is x (t) = 8 sin (t), where t is in seconds and x in centimeters. find the velocity and acceleration of time.

If a forklift raises a 76-kg load a distance of 2.5 m, about how much work has it done?

When a fork is placed in a hot piece of lasagna, thermal energy is transferred up the fork by ...

Levi observed properties of four different waves and recorded observations about each one in his chart.

A rocket is shot straight up from the earth, with a net acceleration (acceleration by the rocket engine minus gravitational pullback) of during the initial stage of flight until the engine cut out at sec.

Which moon has a thick atmosphere made mostly of nitrogen?