Mechanics | Relativity Answers

A man in a sled, with a total mass of 125 kg, slides down a grassy hill and reaches a speed of 8 m/s at the bottom. If a pile of grass can exert a constant force of 250 N, how fast will the sled stop?

Two identical 15.0-kg balls, each 25.0 cm in diameter, are suspended by two

35.0-cm wires. The entire apparatus is supported by a single 18.0-cm wire,

and the surfaces of the balls are perfectly smooth.

a) Find the tension in each of the three wires.

b) How hard does each ball push on the other one?

Leo who has a mass of 70 kg stretches

the trampoline mat by 37 cm. Calculate the

elastic potential energy he puts into the

trampoline mat.

a body requires a force of 100N to accelerate it at a rate of 0.2m/s^2. determine the mass of the body in kilograms and in slugs

An object with an initial velocity of 20 m/s accelerates uniformly at 5 m/s 2 in the direction of its motion at a distance of 10 m. What is the final velocity of the object?

In a 300-m race, runner A starts from rests and accelerates at 1.6m/s2

for the first 30 m and then runs

at a constant speed. Runner B starts from rests and accelerates at 2.0m/s2

for the first 30m and then

runs at a constant speed. Runner A begins running as soon as the race begins but B firsts takes a nap

to rest up. What is the longest nap that B can take and still not to lose the race?

So how would you calculate the force of F needed to keep the engine stationary by first resolving the forces into their horizontal and vertical components.

A car traveling at constant velocity of 20m/s passes a stationary police car and 15 seconds later the police car accelerates uniformly at 4m/s to reach a speed of 30m/s with which it continues. a) draw a velocity time graph. b) find where the second car overtakes the first car. c) find the distance up to which the second car overtakes the first car

A train starts from a station at point A and accelerates uniformly to a speed of 20m/s. It maintains this speed and then retards uniformly until it comes to rest at point B. The distance between the stations is 2000m the total time taken is 2 minutes.if the acceleration is twice the retardation. a) draw a velocity time graph. b) find the time for which the train is moving at constant speed. c) find it's retardation

Jamylla and Janylla are on a hike. Both hikers begin a trip by walking, the first leg A: 2.65 km, 140° from their base

camp, on their second leg B: 4.77 km, 252° and to complete their final leg C: 3.18 km, 332°. What is the magnitude and

direction of their final position from their base camp? Apply polygon method and component method and compare their

results.