Mechanics | Relativity Answers

a rod XY of weight 16 N is hinged at X and supported by a string at Y. the string is at an angle of 30 degree . the tension in the string is 16 N
what is the horizontal component of the force acting at X?
A)5.0 N
B)9.0 N
C)14 N
D) 16 N

A rail gun accelerates a projectile with a constant acceleration of 50.0 m/s2. The projectile starts at rest and moves1.00 m along the rail. Atthe end of the rail, what is the projectile’s speed?

My P2 team of Brock, Jesse, Mackenzie, and Tyler challenged my P4 team of Hannah, Kendall, Avery, and Renee to a tug-o-war.
Here is the list of forces during the tug-o-war
P2 team: Brock 450N, Jesse 225N, Mackenzie 200N, Tyler 340N P4 team: Hannah 138N, Kendall 215N (she only used one hand) Avery 274, Renee 138N.
What was the net force? Who won?

The velocity of water flow in a river is 10ms-1. The width of the river is 100 meters. Two boatman are having a race for reaching the other side of the river. Boatman 1 can drive his boat with velocity 15ms-1 in still water; and Boatman 2 can drive his boat with a constant acceleration of 4.5 ms-2 in still water. Who wins the race? (Note: Both of the boatmen are good at physics and thus follow the path which will be most efficient. Also note that, the one who reaches the opposite side of the river first wins, regardless of their position the reach at. i.e. they don’t need to end up exactly at the opposite side of where they started)

A car accelerates from the rest to a speed of 10m/s in 4 seconds. It then decelerates to rest in 2 seconds.
A)draw the speed-time for the car?
B)work out the total distance travelled?

A force of 150 N pushes a crate 7.6 m in 2.6 s what is the power

a car travels 30 meter for 30 minutes. the car then stop at a service station fir 10 minutes the car continues for another 20 minutes at a constant speed of 45m/s. draw the distance -time graph fir the car?

U throw a stone horizontally at a speed of 2.9m/s from the top of cliff that is 37 m high. How long does it take to reach the bottom . How far from the base does the stone hit the ground?

A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If the center of the target is level with the rifle, how high above the target must the rifle barrel be pointed so that the bullet hits dead center

The gravitational field strength at Earth's surface is about 9.81 N/kg [down]. What is the gravitational field strength exactly 1.6 Earth radii from Earth's centre?