Mechanics | Relativity Answers

which one of the following has the lowest viscosity

A. Water

B. Motor oil

C. Marble syrup

D. Glue

E. None of the above

a car is traveling up a hill that is inclined at an angle x above the horizontal determine the ratio of the magnitude of the normal force to the weight of the car when x=15degrees and x=35degrees

A 15-kg rock is dropped from rest on the earth and reaches the ground in 1.75 s. When it is

dropped from the same height on Saturn’s satellite Enceladus, it reaches the ground in 18.6 s.

(a) What is the acceleration due to gravity on Enceladus? (b) How long will it take for the

rock to reach the ground on Earth if it was released 100 m above the Earth’s surface? (c) in

Enceladus?

The tension in a string holding a solid block below the surface of a liquid (of density

greater than the block) is T0 when the container is at rest. When the container is given an upward acceleration of 0.250g, what multiple of T0 gives the tension in the string?

FIGURE 6 shows a 3.0 kg box sliding down with constant speed u = 1.2 ms-1 along a rough plank inclined at an angle 25o with the horizontal. Calculate the rate of work done by the frictional force on the block. (Given g = 9.81 ms-2)

A 10kg projectile is fired vertically upward from the ground. with an initial velocity of 50m/s. Determine the maximum height to which it will travel if atmospheric resistance is neglected.

A car is driven west for a distance of 50 km, then north for 30 km, and then in direction 30° east of

north for 25 km. Determine the total displacement of the car from its starting point by drawing the

vector diagram.

A man standing on the roof of a building throws a ball with a velocity 18.0 ms-1 at an angle 50o from the horizontal. The height of the building is 35.0 m. (Given g = -9.81 ms-2) Calculate:

(i) the maximum height of the ball from the ground,

(ii) the magnitude of the velocity of the ball just before it strikes the ground.

You are standing on a sheet of ice on a skating rink and your mass is 68.00 kg. Your 70.0 kg friend throws you a 0.450 kg ball that is travelling horizontally at 9.00 m/s. (a) If you catch the ball, with what speed do you and the ball move afterward? (b) If the ball hits you and bounces of your chest that it moves 7.50 m/s horizontally in the opposite direction, what is your speed after the collision?