In raising a 3000-n with a pulley system, it is noted that for every 2 m of rope pulled down, the rises 0.2 m. ideally, what force is needed to lift the? a 150 n

If the speed of a vehicle was reduced from 65 miles per hour to 35 miles per hour, by approximately how many kilometers per hour was the speed reduced? (1 kilometer = 0.62 mile, rounded to the nearest 0.01 mile)

When resistors are connecting in a series, does the position of ammeter make any difference?

The distance between two consecutive nodes of a standing wave is 21.9 cm. the hand generating the pulses moves up and down through a complete cycle 2.13 times every 3.65 s. find the velocity of the wave. answer in units of m/s.

An electrostatic force of 81N exist between a charge of + 2 x 10-5C and a second charge of + 4.5 x 10-4C. What is the distance between the two charges? Is it attractive or repulsive?

What makes science different from other fields of knowledge like art or philosophy?

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?

In a nuclear power plant, the temperature of the water in the reactor is above 100°C because of what?

Determine the total mechanical energy of a 250 g baseball if it has a velocity of 30 m/s when it leaves the pitcher's hand 1.2m above the ground.

When distances were carefully measured from Earth to globular clusters above and below the Milky Way plane (where our view of them is not obscured by interstellar dust and gas), their distribution was found to be