After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 55.0 cm. she finds that the pendulum makes 110 complete swings in a time of 140 s. what is the force of gravity on this planet?

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest