Mechanics | Relativity Answers

Suppose you decide to travel to a star 65 light-years away with a speed that tells you the distance is only 25 light-years. How many years would it take to make the trip?

In a terrestrial frame of reference, a star is 56 light-years away. How fast would a person have to travel so that the distance to him is only 35 light-years?

G=GMm/r² where f is magnitude of the force m and m are the sizes of each mass r is the distance between the masses and G is a constant if both M and r are halved keeping all other values constant what is the ratio of the new force F1 to the original force f0 (F1/f0

Two balls A and B, weighing 49 N each, approach each other, with speeds of 20 m/s and 30 m/s respectively. Determine their speeds after the collision if (a) the coefficient of restitution is 0.80, and (b) they are completely inelastic. 

Water flows through a venturi meter which contracts from D = 300 mm to

d = 150 mm at the rate of 0.0037 m3

/s and the differential gauge has a

deflection, h of 1 m, as shown in the figure below. Specific gravity of the

gauge liquid is 1.25. Determine the coefficient of discharge of the meter.

Determine vector A x C if A = 5i - 4j and B = 5i + 2j

A golf ball is driven with an initial velocity of 161 fps

upward at 30 ̊ to the horizontal from an elevated tee

64.4 feet above a level fairway. What horizontal

distance will the ball travel before hitting the fairway

a box starting from rest and slides down an inclined plane with uniform acceleration and travels 9 m in 3 s. in what time from rest will it acquires a velocity of 24m/s down the plane

1. A boy wants to throw a water balloon from a roof deck at a height of 3m from the street and hit the far side of the street. He throws the ball at 5 m/s at an angle of 45° to the horizontal. If Vboy = 0, what is the maximum height, h, reached by the balloon above the street?

A. h= 5.9 m B. h = 5.1 m C. h = 3.6 m D. h= 4.6 m

2.This time, suppose the boy gets a running start, vboy = 5m/s toward the street. What is the speed of the balloon, V balloon, when it hits the street

We have a horizontal spring with a mass attached oscillating with a maximum displacement of

A

on either side. At which intermediate displacement(s) the kinetic energy would equal the potential

energy [10]?