Mechanics | Relativity Answers

2 boys push a tool case at the same time. 1 boy pushes the case with a force of 3.10 N to the right. the second boy pushes the case with a force 1.80 N to the left. what is the magnitude and direction of the net force of the case?

Jack swims 9lengths of the pool in 153.9s (2 min and 33.9s), whereas Jill, the faster swimmer, covers 10lengths in the same time interval. Find the average velocity and average speed of each swimmer.

Two astronauts are facing off in a fight outside the International space station. Astronaut Pitt (78 kg) and astronaut Reeve (80 kg) are initially at rest with respect to each other. Pitt pushes Reeve hard towards the earth at a speed of 3 m/s. Ignoring friction,
a) What is the velocity of Pitt after the push?

b) What is the minimum amount of chemical energy that is converted into mechanical energy in Pitt’s muscles from his action?

A gun of mass 2.0kg fired a bullet of mass 0.02kg wit d velocity of 15o/m, calculate d kinetic energy of d gun and kinetic energy of d bullet. Formula =1/2x mass x velocity.

A greenish pump has tap section pipe. The pipe is running full of water. The pipe diameter at the inlet and at the upper end are 1metre and 0.5metre respectively. The free water surface is 2metre above the inlet and centre upper end is 3metre above the top of the free water surface. The pressure at the top end of the pipe is 25cm of mercury and it is known that loss of head by friction between tap and butttom section is ¹tenth of the top section. Compute the discharge in line per second

The potential energy of a body at height 'he' is 'x' joules, which it reaches to the ground its potential energy will become?

A baseball batter swings a 1.54 kg bat at a 356 g ball traveling at 48.7 m/s and the ball is hit 486 ft over the center field wall in 3.6 s. What is the velocity of the bat?

angular velocity of a fan increases from
1
20 
rad s
to
1
30 
rad s
in 5s. Find the angular

acceleration and the total angle

(a driver is suing the state highway department after a accident on a curved freeway. The driver lost control and crashed into a tree located a short distance from the outside edge of the curved roadway. The driver is claiming that the radius of curvature of the unbanked roadway was too small for the speed limit, causing him to slide outward on the curve and hit the tree. You have been hired as an expertwitness for the defense, and have been requested to use your knowledge in physics to testify that the radisu of curvature of the roadway is appropriate for the speed limit . State regulations show that the radius of curvature of an unbaked roadway on which the speed limit 65mi/h must be at least 150m You build accelerometer which is a plumb bob with a protractor that you attach to the roof of your car. An associate rididing in your car witth you observes that the plumb bob hangs at an angle 15 degree from the vertical when the car is driven at safer speed of 23m/s the radius of the curve?

A body of mass 5.0 kg is drawn at a constant speed through a distance 6 m along a horizontal
floor by a rope exerting a constant force of magnitude 10N at an angle of 300 with the horizontal. Calculate the work done by friction on the block