Calculate the wavelength λ1 for gamma rays of frequency f1 = 7.50*1021 hz.

You have a grindstone (a disk) that is 95.2 kg, has a 0.399 m radius, and is turning at 93 rpm, and you press a steel axe against it with a radial force of 19.6 N. (a) Assuming the kinetic coefficient of friction betweensteel and stone is 0.

When sitting in the tree the cat has a total of 1375J in its Gravitational potential store. What is the maximum amount of energy that can be transferred when the cat lands on the ground?

Using kepler's 3rd law and newton's law of universal gravitation, find the period of revolution p of the planet as it moves around the sun. assume that the mass of the planet is much smaller than the mass of the sun.

A 235 g gold ball at a temperature of125°C is dropped into an insulated flask of water. The water was initially at a temperature of22°C. If the equilibrium temperature is 25°C, what is the mass of the water?

4. You have a frustrating day and just feel like screaming; you grab a pillow to scream into it. Which interaction of sound would take place here, (reflection, refraction or absorption), and how did the sound waves move?

Meteoroids usually come from?

An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second star.

Crane lifts a 1,052 kg car. What force in Newtons must the crane apply to the car to lift it?

Consider a circuit with a main wire that branches into two other wires. If the current is 10 A in the main wire and 4 A in one of the branches, how much current is in the other branch?

A negative charge of - 2 C and a positive charge of 4 C are separated by 84,681 m. What is the force between the two charges?