Mechanics | Relativity Answers

A boat propelled so as to travel with a speed of 0.50m/s in still water, moves directly (in a straight line ) across a river that is 60m wide. The river flows with a speed of 0.30m/s. how long in seconds does it take the boat to cross the river ?

A 2 kg block is on 5 kg block. The system of blocks falls freely due to gravity . The net force on 5 kg block is :
(Take g = 10 m/s2)

(1) Zero (2) 50 N (3) 70 N (4) 20 N

a block of mass 2 kg rests on a rough inclined plane making an angle 30 degree wth horizontal,the coefficient o static friction between the block and the plane is 0.7.the frictional force on block is

Decent vehicle is traveling vertical@ 5.5 m/s and has horizontal velocity of 3.5 m/s . What speed and angle is descent path

A car travels 2.47 km in the x-direction, then turns left 83.5◦ to the original direction and
travels an additional distance of 1.77 km.
Calculate the x component of the car’s net displacement.

Sally travels by car from one city to another. She drives for 27.0 min at 66.0 km/h, 45.0 min at 35.0 km/h, and 54.0 min at 80.0 km/h, and she spends 7.0 min eating lunch and buying gas.
Determine the average speed for the trip.

A man steps and falls freely from rest from a tower to the ground. If he falls half the total height of the tower in last 1 second of his motion. Find height h of the tower?

A fisherman has caught a very large, 5.0 kg fish from a dock that is 2.0 m above the water. He is using lightweight fishing line that will break under a tension of 56 N or more. He is eager to get the fish to the dock in the shortest possible time.

If the fish is at rest at the water's surface, what's the least amount of time in which the fisherman can raise the fish to the dock without losing it?

An object has an acceleration of 8.0 m/s/s. If the net force experienced by the object is decreased by a factor of 3.7 and if the mass of an object is decreased by a factor of 2.6, then the new acceleration would be

Honda claims that its new super civic sports car will accelerate uniformly from rest to a speed of 87m/s in 8.0 seconds. A) determine the acceleration B) find the distance the car travels in the first 8 seconds.