A boy exerts a force of 225 n on a lever to raise a 1250 n rock a distance of 0.13 m. if the lever is frictionless, how far did the boy have to move his end of the lever?

A light bulb produces light with frequency = 4.65 x 1014 Hz. What is the wavelength of light the bulb produces? 6.45 x 10-7 meters 1.55 x 106 meters 6.45 x 1021 meters 1.395 x 1023 meters

Changing the food given to hamsters causes different weight gain. why is this hypothesis bad?

A water discharge of 9 m3/s is to flow through this horizontal pipe, which is 0.98 m in diameter. If the head loss is given as 10 V2/2g (V is velocity in the pipe), how much power will have to be supplied to the flow by the pump to produce this

What has a definite ratio of components

An invalid argument with one true premise, one false premise, and a true conclusion.

Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. A.

If you drop a silver dollar off a building and it hits the ground in 10 seconds, how fast was the coin going just before it hit?

What is the weight of an with a mass of 32kg

The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660. A beam of white light in this glass strikes the glass-air interface at a 25.50∘ angle of incidence and refracts out into the air.

The locations of the major pressure and wind systems on the earth: