In which situation is no work being done?

a person carrying a box from one place to another

a person picking up a box from the ground

a person pushing a box from one place to another

a person pulling a box from one place to another

The greatest possible acceleration and deceleration that the train may have is a and its maximum speed is v. Find the minimum time in which the train can get from one station to the next if the total distance between the stations is s.

Acceleration directed toward the center of a circular path that produces uniform circular motion is

An ideal gas at 0∘C consists of 1.0*1023 atoms. 20 J of thermal energy are added to the gas. Part A What is the new temperature in ∘C?

Why is the amount of mechanical energy produced less than the amount of electrical energy used?

A tow truck moves an illegally parked car with 4598J of kinetic energy. The car weighs 2222 kg. At what speed is the tow truck pulling the car?

Two children playing on a frictionless garden gate invent a new game called "gate". The idea is that they will get on opposite sides of the gate and each push such that the gate does not move.

What is the frequency of 20 mm microwaves? A) 100 MHz B) 400 MHz C) 15 GHz D) 73 GHz E) 98 GHz

A measure of how much pulling, or tension, a material can withstand before breaking is - A. hardness. B. brittleness. C. tensile strength. D. malleability.

How work done against gravity can be expressed?

An electron is acted on by two electric forces, one of 2.7*10-14 N acting upward and a second of 5.8*10-14 N acting to the right. What is the magnitude of the electric field at the electron's location?