Mechanics | Relativity Answers

A stone is thrown with an initial velocity of 12.0 m/s at an angle of 55° with the ground. The initial velocity of the stone in the x-direction is _____ and the initial velocity of the stone in the y-direction is _____.

Two people are pushing a 35 kg box. One person pushes with a force of 45 North and the other person pushes with a force of 60 N South. What is the resulting force on the box?
A cat is running with a horizontal velocity of 2 m/s. It can't stop in time and flies off the edge of a 1.5 m high counter. All of the following statements are true about the cat except
a. its acceleration in the x-direction is -9.8 m/s2
b. its velocity in the x-direction just before it hits the ground is 2 m/s
c. its initial velocity in the y-direction is zero
d. its velocity in the x-direction just before it hits the ground is zero
Which object would have more kinetic energy, a 50 kg person running 10 m/s or a 50 kg person running 15 m/s?
Two weightlifters are each able to lift 120 kg. One is able to lift it in 1.2 seconds and the other is able to lift it in 1.8 seconds. Which person generated more power?
Two moving cars stick together after colliding. What must be true about the cars?

A cannonball is shot toward a target on the ground a certain distance away. If it was shot at an angle of 35º and hit the target, what other angle could the cannonball be shot from and still hit the target? (assume the cannonball is shot with the same velocity)
A snowflake is floating through the air with a constant velocity. The net force acting on it is _____ and its acceleration is _____.
Two people are pushing a 35 kg box. One person pushes with a force of 45 North and the other person pushes with a force of 60 N South. What is the acceleration of the box?
According to Newton's Law of Universal Gravitation, as the distance between two objects increases, the force between them
According to the impulse-momentum theorem, the more force there is applied to an object,
A roller coaster is at the top of a 45 m hill. Which of the following must be true?

Most of the energy in a gasoline engine is lost as?

the relation between time t and distance x is t = ax square + bx where a and b are constants.find acceleration ?

a car starting fom rest accelerates at the rate f through a distance s then continues at constant speed for time t and then decelerates at the rate f/2 to come to rest.if the total distance transversed is 15s then find s

two cars of equal mass m = 0.250 kg are placed on a fricitionless track that has a light spring of force constant k = 50.0n/m attaced to one end of it as vo= 3.00m/s to the right and the blue cars is intitially at rest if the cars collide elastically find a ) the velocity of the cars just after the first collision and b) the maximum compression of the spring

The planet earth is 1.5 10^11 from the sun and orbits the sun in one year. The planet
Pluto takes 248 years to orbit the sun. How far is Pluto from the sun?

A massless rope is horizontally stretched between two supports 3 m apart.when an object of weight 3200 N is hung at centre of rope rope sag by 50 cm . Calculate the tension in rope

is there any work done by individual non conservative forces?