Mechanics | Relativity Answers

A ball is thrown with a speed v=6.9m/s at an angle θ=22◦ with respect to the horizontal ground. At the highest point in the motion, the strength of gravity is somehow magically doubled. What is the total horizontal distance traveled by the ball by the time it returns to the height from which it was thrown? (Ignore air resistance.)

The tip of a robot arm is moving to the right at 13m/s. Four seconds later, it is moving to the left at 2m/s. What is the magnitude of the change in velocity and what is the average acceleration? (Assume that the +x direction is the positive direction)

A object with mass 0.688 kg is attached to a horizontal spring with a spring constant of 5.66 N/m. The object slides back and forth on a horizontal frictionless surface. The object is pulled back 5.40 cm and released.
What is the total mechanical energy of the object just as it is released?

How fast is the object traveling when it is a distance 1.78 from equilibrium (presume it is traveling in the positive direction).

A simple pendulum is created using a object of mass 0.723 kg attached to a string of length 1.43 m and negligible mass. The object is pulled back 3.00 cm and released. The experiment is being done near the surface of the Earth.
What is the period of the pendulum?

What is the frequency of oscillation of the pendulum?

Close to the center of a campus is a tall silo topped with a hemispherical cap. The cap is
frictionless when wet. Someone has somehow balanced a pumpkin at the highest point. The
line from the center of curvature of the cap to the pumpkin makes an angle

if a box has 5.0x10^2 J of work done to it, is moved with 25N. What is the distance it moved?

Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 390 m/s. What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 5.0 times his true weight?

At a certain time a particle had a speed of 18 m/s in the positive x direction, and 2.4 s later its speed was 30 m/s in the opposite direction.What is the average acceleration of the particle during this 2.4 s interval?

A cheetah has 3.1 x10^4 of kinetic enegru while running a 100km what’s its mass

A car and a truck are initially moving in the same direction at 20 m/s with the truck 38m ahead.the car accelerate at a constant 2m/s^2 passes the truck and return to the right lane when it is 11m ahead of the truck.how far has the truck moved during this time?