magnitude and direction of the total force exerted on the car by the track

A roller coaster car of mass 320 kilograms(including passengers) travels around a horizontal curve of radius 35 meters. Its speed is 16 meters per second. What is the magnitude and direction of the total force exerted on the car by the track?

how far the coin can be placed without having the coin slip off

A coin is placed on a record that is rotating at 33.3 revolutions per minute. If the coefficient of static friction between the coin and the record is 0.1, how far from the center of the record can the coin be placed without having it slip off?

Optics question, prisms, field strength, internal reflection, infinity microscope

A laser beam of amplitude E0 is directed into a semi-circular prism, towards the flat surface side and internally reflected against the flat face so that the angle of incidence q is beyond the critical angle. How does the field strength as you move the laser up along the vertical direction, from the interface change with di ...continues

newton's second law of motion

Scientists are experting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0-kg projectile from rest to a speed of 4.0 x 10^3 m/s^2. The net froce accelerating the projectile is 4.9 x 10^5 N. How much time is required for the projectile to come up to speed?

newton, s second law of motion

An airplane has a mass of 3.1 x 10^4 kg and takes off under the influence of a constant net force of 3.7 x 10^4 N. What is the net forcethat acts on the plane,s 78-kg pilot?

newton, s second law of motion

An arrow, starting from rest, leaves the bow with a speed of 25.0 m/s. If the average force exerted on the arrow by the bow were doubled, all else remaining the same, wiht what speed would the arrow leave the bow?

The vector nature of newtons second law

Airplane flight recorders must be able to survie catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the test is an impact shock test, in which the box must survive being thrown at high speeds against a barrier. A 41-kg box is throw ...continues

The gravitational Force

Arock of mass 45 kg accidently breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 250 N. What is the magnitude of the acceleration of the rock?

The normal force, Static and Kinetic Frictional Forces

A 35-kg crate rests on a horizontal floor, and a 65-kg person is standing on the crate. Determine the magnitude of the normal force that (a)the floor exerts on the crate and (b) the crate exerts on the person.

The normal force, static and kinetic frictional forces

A cup of coffee is setting on a table in a airplane that is flying at a constant altitude and a constant velocity. The coefficient of the static friction between the cup and the table is 0.30. Suddenly, the plane accelerates, its altitude remaning constant. What is the maximum acceleration that the plane can have without the cup ...continues