Mechanics | Relativity Answers

A pendulum bob is released from some initial height such as the speed of the bob at the bottom of the swing is 1.0 m/s. What is the initial height of the bob? Answer in units of m

A 2.7x10^3 kg car accelerates from rest under the action of two forces. One is a forward force of 1154 N provided by traction between the wheels and the road. The other is a 915 N resistive force due to various frictional forces. How far must the car travel for its speed to reach 2.1 m/s? Answer in units of m

A BULLET OF MASS 50 G MOVING WITH INITIAL VELOCITY 100M/S STRIKES A WOODEN BLOCK AND COMES TO REST AFTER TRAVELING A DISTANCE OF 2CM. FIND THE RETARDATION

Five forces act on an object.
(1) 59 N at 90°
(2) 40 N at 0°
(3) 81 N at 270°
(4) 40 N at 180°
(5) 50 N at 60°
What are the magnitude and direction of a sixth force that would produce equilibrium?

a carnival ride the passengers travel at constant speed in a circle of radius 5cm. they make 1 complete circle in 4seconds.what is their acceleration ?

The coefficient of friction between a truck's tires and the road is 0.75. A 1400 kg truck is moving at 100.0 km/h when a black bear jumps onto the highway 80.0 meters ahead. The driver has a reaction time of 0.55 seconds before the brakes are applied. Will he be able to avoid the accident? Justify your answer by showing calculations.

4 men lift 250kg box to a height of 1m and hold it without raising or lowering it.
(a)How much work is done by the men in lifting the box?
(b)how much work do they do in just holding it?
(c)Why do they get tired while holding it?

A work of 500 Joules is done when a force of 20 Newton is applied to a cart. Calculate the distance through which a cart moves and states its direction

an airplane taxis to the end of a runway before taking off. the magnitude of the planes total displacement is 599m. if the northern component of this displacement is 89m, what is the displacements eastern component? what is the direction of the total displacement?

an airplane heads west at 400 miles per hour in a 50 mile per hour northwest wind. Find the ground speed and the bearing of the airplane