Mechanics | Relativity Answers

A horizontal force of 0•80N is Required to pull A 5kg Block Across a table top at a constant speed. With the block initially at rest again. Determine the speed v of the bullet where the bullet is assumed to be embedded in the block.

A body of mass 80kg moving with a velocity of 3 meter per second hit a stationary body of mass 40kg.

a. If the bodies move together after impact . Calculate the velocity of the composite body just after impact.

b. If the bodies do not move together and the body of mass 40kg is moving with a velocity of 3 meter per second in the same direction as that of the body of mass 80kg . Find the velocity of the 80kg after impact.

A ball of mass 5.0kg moving with a velocity of 10meter per second collides with a 15.0kg ball moving with a velocity of 4 meterper second. If both balls stick together after collision. Calculate their common velocities after impact if they initially move in

a. same direction

b. Opposite direction

Why do you think the smallest mass increment provided with the force table is 5-g? Why didn’t I give you a pile of 1-g masses?

On your cousin’s wedding day you leave for the church 30.0 min before the ceremony is to begins, which should leave plenty of time since the church is only 40.0 km away. On the way, however, you have to make an unanticipated stop because of road construction work. As a result, your average speed for the first 10 min is only 15.0 km/h.

What average speed do you need to have on the remainder of the trip to get you to the church on time?

A train has a maximum speed 20m/s which it can achieve at an acceleration of 0.25m/s with its brake fully applied, the train has a deceleration of 0.5m/s². What is the shortest time the train can travel between two stations 800m apart if it's stops at both stations?.

A body moves from a position r²=(I + 2j –3k) meter under the influence of constant force F=( 3i +3–k) Newton. Calculate the work done by the force.

A thin 20-cm x 20-cm flat plate is pulled at 1 m/s horizontally through a 3.6-mm-thick oil layer sandwiched between two plates, one stationary and the other moving at a constant velocity of 0.3 m/s, as shown below. The dynamic viscosity of the oil is 0.027 Pa.s. Assuming the velocity in each oil layer varies linearly (a) plot the velocity profile and find the location where the oil velocity is zero (b) determine the force that needs to be applied on the plate to maintain this motion.

Determine the force in each member of the loaded truss. All triangles are isosceles.

To avoid a potential collision with wildlife cross the road, the driver of a car traveling 105 km/h fully applies the brakes to stop as quickly as possible. If the car stops 3.8 s after the brakes are applied, what is the braking distance ?