Mechanics | Relativity Answers

A uniform beam XY of length 1 meter supported at P (the pivot) where PX is 20 cm. The beam's weight 5N. What downward force is exerted at X that will make the beam balanced?
Possible Answers: A. 5N , B. 7.5N , C. 12.5N , D 20N.

a boat with an initial speed of 5,0m/s accelerate at a uniform rate of 1.2m/s for 5.0s. what is the final speed of the boat during this time

Approximately, the stopping distance of a car travelling at v km/h is given by the expression 5/24(v +(v^2)/32)m (v is measured in km/h), the 1st term representing the `reaction' distance of the driver and the second the distance through which the brakes are actually applied. Two cars are 35 m apart
when the 1st car, travelling at 45 km/h, makes an emergency stop. The driver of the second car has no prior warning of this hazard. Show that a collision must occur if the speed of a second car exceeds 71 km/h.

an airplane flies at 200.00Km/hr with respect to the air. What is the velocity of the plane relative to the ground if it flies with
a. 50 km/hr tailwind?
b. 50 km/ hr headwind?
draw schematic and explain

In Chapter 4, you calculated the braking acceleration for a car based on data in a drivers handbook. The acceleration was -12.2 m/s2. If the car has a mass of 925 kg, find the frictional force and state the direction.

You are driving a 2500.0-kg car at a constant speed of 13.0 m/s along an icy, but straight and level road. While approaching a traffic light, it turns red. You slam on the brakes, Your wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 25.0 m. What is the coefficient of sliding friction (µ) between your tires and the icy roadbed?

A 214-kg crate is pushed horizontally with a force of 714 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.

A student rides a bycycle along a straight road for 30.0. She travels 254m away from her home. Find her average velocity

A person walks 49 m East and then walks 30 m at an angle 49 degrees North of East.
What is the magnitude of the total displacement?

what is the velocity of the run when a student runs 2 laps around a track in 120 seconds when the distance of the track is 400