Mechanics | Relativity Answers

How to solve it Two teenagers are pulling on ropes attached to a tree. The angle between the ropes is 30.0° . David pulls with a force of 400.0 N and Stephanie pulls with a force of 300.0 N. (a) Find the component form of the net force. (b) Find the magnitude of the resultant (net) force on the tree and the angle it makes with David’s rope.

A body is released from rest at the top of a plane inclined at 30° to the horizontal and 4.0m high.
If the coefficient of the friction between the body and the plane is 0.3 , calculate the time the body takes to reach the bottom of the plane

A drag-racing car goes from 0 to 290 mph in 5.2 seconds. What is it’s average acceleration in g’s?

A large container which has 258 g of water initially at 23 °C is placed in a microwave oven. The magnetron in the microwave oven can produce 950 W of EM radiation. The microwave is turned on for 2.5 minutes.

a) Assuming that all the microwave energy is absorbed by the water, how much water is left in the container?

b) The OXO 8716900 electric kettle (1500 W) manufacturer’s claim that it can boil up to 1.75 L of water faster than the microwave, safer than the stovetop, and runs off a mains voltage of 120 V. Compare the efficiency of the two approaches.

c) Name the different ways of heat loss in these systems (Microwave & Kettle) during the heating process.

A 7.65 kg bowling ball traveling at 12.65 m/s strikes a 1.7 kg bowling pin. The impact slows the bowling ball to 10.13 m/s.



Determine the change in momentum of the pin.

A cannonball with a mass of 12.4 kg is fired from a cannon that has a mass of 758.2 kg. The cannonball is fired with a speed of 195.3 m/s, and it takes 0.007 seconds for the cannonball to leave the cannon.



Calculate the net force acting on the cannon.ework-answers/physics/other

A 11.8 kg bowling ball traveling at 13.86 m/s strikes a 3.0 kg bowling pin. The impact slows the bowling ball to 7.60 m/s.



Determine the impulse given to the pin.

A 9.1 kg bowling ball traveling at 19.1 m/s strikes a 1.6 kg bowling pin. The impact slows the bowling ball to 6.9 m/s.



Determine the velocity given to the pin.

A cannon ball barrel is 6m long. The muzzle velocity of a bullet from the cannon is 305 m/s. What is the average acceleration of the bullet going through the bullet?

a 1.75 kg stone falls from the top of a cliff and strikes the ground at a speed of 58.8 m/s. what is the height of the cliff?