Mechanics | Relativity Answers

A driver of an ambulance going 70 km/h suddenly sees another car 35.0 m ahead. It 

takes the driver 0.62 s before he applies the brakes. Once he does begin to brake, he 

reduces speed at a rate of 13.0 m/s². 

1.1 Determine if the driver will hit the car or not.

A loaded truck moving with a velocity of 10kmh^-1 at a distance 10m away from a rail line applies brake suddenly to see a train running and stops in 5 seconds. Mass of empty truck and load are 1500kg and 400kg respectively.

1. How much distance did the truck travel after applying brake? Find out.
2. If the truck is not loaded, driver can stop the truck easily. Analyze with logic

Explain why the motion of earth around the sun is periodic motion but is not vibratory

A ceiling fan blade is rotating at 1275 rpm (revolutions per minute) . What is its angular velocity in rad/s

The Millikan Oil Drop Experiment calculated the charge of the electron using the concept of velocity dependent force. When electric field is applied, the upward motion of the particle is given by qE – mg – bv = F where mg is the weight of the charged particle, bv is the retarding force, and qE is the force on the charge due in an electric field. a. Derive the expression for the terminal velocity of the oil drop as a function of time using F= -mg - bv.

A bullet with mass 120g hits a ballistic pendulum with mass 30kg and lodges in it. When the bullet hits the pendulum it swings up reaching the height of 0.25m. Neglecting air resistance, calculate the speed of the bullet. 

A particle is fired at 22 degrees with respect to an incline and then hits a point on the incline as label. If the initial velocity is 15 m/s, a. find the time it takes for the projectile to hit the incline plane. b. find the distance from launching point to the landing point.

A popular exhibition among riders in the Philippine is the “banking sa curvada” which is a feat that takes advantage of the structure of the curved road. Originally built for race tracks, the banking is adopted in curved national roads and highways to maximize tire-road friction which keeps the vehicle from tumbling out of the road. Suppose a curvada with a radius of 150m is banked at the right angle for a maximum speed of 25 m/s. At this speed, what is the coefficient of friction between the road and the tire?

The wheel is a ring of mass M. Disregard the mas of the spokes. Mass of the wheel is 5 kg. Its radius is 0.5 meters. Angular velocity is 100 rev/min (see the orange arrow for the direction of rotation) Length of axle or shaft is 0.60 meters. a. Calculate the change in the wheel’s angular momentum per second. b. Looking from the top of the setup, is the precession clockwise or counterclockwise? Why?

A car travels 540km in 4.5 hours.how far will it go in 8 hours at the same average speed?