A man of mass 80kg climbs up 15 steps each 25cm high in 7.5 seconds. Calculate the power that the man develops

What is one exsample of a closed economy

Percy Spencer was an American engineer and, while working for Raytheon, was building magnetrons for radar sets. One day, he was standing in front of an active radar set when he noticed the candy bar he had in his pocket melted.

2. A truck is traveling east through mud that is slowing down its speed. With west defined as negative, which of the following is correct? A. Both its velocity and acceleration are negative. B. Both its velocity and acceleration are positive. C.

A small mass m on a string is rotating without friction in a circle. The string is shortened by pulling it through the axis of rotation without any external torque. What happens to the angular velocity of the object? a. It decreases. b. It increases.

What is the correct displacement for the following vectors: 4 km south, 2 km north, 5 km south, and 5 km north? 2 km south 16 km total 11 km west 6 km south

The football player running toward the goal line has A. Potential energy B. Chemical energy C. Kinetic energy D. Elastic potential energy

If the density of an object is 30 g/cm3 and its volume is 10 cm3, what is its mass in grams?

Explain how atoms are aligned in a magnet in terms of the North and South poles.

Which of the following has the largest gravitational potential energy A. a 10kg dog running down the street at 30mph B. a tightrope walker slowly crossing niagara falls C. a 0.02kg bullet moving down the barrel at 800mph D.

Why does the speed of an object change when a force acts on it?