# Physics

4. A 20-kg box sits on an incline of 30 from the horizontal. The coefficient of friction between the box and the incline is o.30. Find the acceleration of the box down the incline.

3 weeks ago

6. Mikey can kick the ball to Sage with a force of 20 N, making it travel 60m. Give the work done on the ball.

3 weeks ago

You are a crash test analyst for Toyota. Car 1 (mass = 900 kg) is at rest while Car 2 (mass = 1700 kg) is traveling toward Car 1 at 15.0 m/s. The two cars collide and and their bumpers stick together. What is the resulting momentum after the collision?

3 weeks ago

.A 2155 kg demolition ball swings at the end of a 17.5m cable on the arc of a verticalcircle. At the lowest point of the swing, the ball is moving at 8.6m/s. Determine the tension in the cable at the lowest point. (Hint: T-mg =mv^2/r)

3 weeks ago

which type of which type of orbit is shown in the picture below?

3 weeks ago

Baseballs arent especially bouncy. A baseball fired at 20 m/s at a solid wall rebounds at 11 m/s. What fraction of the initial kinetic energy is transformed into thermal energy?

3 weeks ago

On a train moving , 75 m/s you roll a ball towards the front of the train with a speed of 5m/s. Your friend standing some unknown distance away from you catches it. To a person outside the train, the ball traveled 220m until it was caught. How far away is your friend standing from you?

3 weeks ago

A star was observed to have a planet orbiting it at a distance of 1.12108 km. The orbital period of the planet is 329 days. Calculate the mass of the star.

3 weeks ago

Polaris is also called the North Star because Earth's NorthPole points toward it. As Earth rotates, other stars seem tospin around Polaris in a counterclockwise direction. In one.day, the stars will make one complete circle (360) aroundPolaris. Compare the positions of the constellations in thetwo diagrams. Calculate how many hours have passedbetween the first and second diagrams.

3 weeks ago

how was the third law of motion discovered

3 weeks ago

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