Mechanics | Relativity Answers

an elevator accelerates upward at 3m/s2 for a brief time. a 500 N women standing on bathroom scales notices the reading is not what she expected. what do the scales read?

A 11.8 N force acts horizontally on a 3.9 kg box sitting on a frictionless surface of ice. Determine the acceleration of the box.

you are driving down a straight road at 54km/hr.when you are 30m from a side street a car abrutly pulls out in frount of you 1s to react tp the car and if your maximum acceleration is 5 m/s2 can you stop in time to aviod an accident?

The first 3 seconds the car moves with 6m/s speed other 2 seconds the car moves with 14m/s. What is the average speed of the car?

a volleyball is shot from one end A, 2 m above the ground, of a field.The ball passes over the net placed in the middle of the field.If the net is 2.44 m high and the field is 18 m length,determine the initial speed and the angle of shooting of the ball at the launching point A.

two forces of magnitude 8N and 15N respectively act at a point.if the force is 17N,the angle between the forces has to be
1.60
2.45
3.90
4.30

a bullet moving with a speed of v can just penetrate two planks of equal thickness. find the no. of such planks that the bullet will penetrate if its speed is doubled

An airplane trip involves three trips with two stopovers from its base. the first trip is 670 Km west the second one is 510 km northeast and the third one is 620 Km (37 degree) west of south .
a- what is the plane total displacement (magnitude and direction)
b-what is the magnitude and direction of a fourth trip to bring the plane back to its base

Two objects of equal mass, m, are separated by a distance d. Answer the following questions: a) If the distance was doubled, what would happen to the force of attraction? Doubled Quadrupled No Change Cut by 1/4th Cut by 1/2 b) If the mass of the first object was doubled, what would happen to the force of attraction? Cut by 1/4th Cut by 1/2 Doubled No Change Quadrupled c) If the mass of both objects was doubled, what would happen to the force of attraction? Cut by 1/4th Cut by 1/2 Quadrupled Doubled No Change d) If the distance was cut in half, what would happen to the force of attraction?

a cyclist is going from mile mark 20 to mile mark 50 in 30 mins. what is the cyclist speed ? can we know the cyclist acceleration ? why? what is the cyclists speed min to second ?