A 30w light bulb uses 600J of electrical energy in a certain period of time. In that time, it produces 450 J of light energy. The rest of the energy is wasted calculate the efficiency of the light bulb

You are skateboarding and push back with one leg, and, as a result, the skateboard moves forward. Which law of motion is being described in this scenario?

A 30.0 μf capacitor initially charged to 20.0 μc is discharged through a 1.10 kÏ resistor. how long does it take to reduce the capacitor's charge to 10.0 μc?

Consider the electrostatic force between two particles of equal mass m = 32 * 10^-26 kg and carrying different charges q1 = 17e and q2 = 28e, where e denotes the magnitude of the charge on an electron.

Why can protons not be rubbed off one material and transferred to the other?

A sample of a solid substance has a mass m and a density?0 at a temperature T0. (a) Find the density of the substance if its temperature is increased by an amount? T in terms of the coefficient of volume expansion?.

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?

A 4.00 kg stone is dropped from a height of 145 m. What is the stone's potential and kinetic energy respectively when it is 50.0 m from the ground?

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)

What is the acceleration rate of an object if the amount of force applied on the object is 75 Newtons and the object has a mass of 15 kilogram?

Two children pulling the rope with the same force in opposite direction is that an unbalanced force or a balanced force