Share
Explore BrainMass

Velocity

A Collision problem.

A 0.15 kg ball hits a wall with a velocity of (6.00 m/s) i + (6.50 m/s) j + (5.50 m/s) k. It rebounds from the wall with a velocity of (2.00 m/s) i + (3.50 m/s) j + (-3.20 m/s) k a) What is the change in the ball's momentum? (__i +__j +__k ) kg · m/s b) What is the impulse on the ball? (__i +__j +__k ) N · s (c) Wh

Momentum: Rocket Firing in Space

A rocket, which is in deep space and initially at rest relative to an inertial reference frame, has a mass of 265*10^105 kg, of which 200*10^5 kg is fuel. The engine is fired for 250s, during which fuel is consumed at the rate of 480 kg/s. The speed of the exhaust product relative to the rocket is 3.23 km/s. a) What is the rock

Momentum concepts

Why is it difficult for a fire-fighter to hold a hose that ejects large amounts of water at high speed? If an 18-wheeler hit Geo (small car) at equal speeds in a head-on collision: Which vehicle will experience the greatest ... force of impact? change in momentum? acceleration? A billiard ball will stop when it collid

Collisions and Momentum

Question: Miguel has a mass of 100 kg and is running toward end-zone at 9 m/s. Gonzales mass of 75 kg runs at Miguel at 12 m/s. They collide at two year line. Does Miguel score? Explain using momentum or collision.

Collisions

Question: A tennis player returns a 30 m/s serve back at 25 m/s after making contact with the ball for .5 seconds. If the ball has a mass of 0.2 kg, what is the force she exerted on the ball?

Impulse and Velocity

Question: A 50 kg cart is moving across a friction-less floor at 2 m/s. A 70 kg boy, riding the cart, jumps off so that he hits the floor with zero velocity. 1. What impulse did the boy give to the cart? 2. What was the velocity of the cart after the boy jumped?

Momentum and Impulse inquiry

While being thrown, a net force of 132 N acts on a baseball (mass = 140 g) for a period of 4.5 X 10^-2 seconds. The balls initial velocity is zero before leaving the pitchers hand. When the batter hits the ball, a net force of 1320 N, opposite the direciton of the balls initial motion, acts on the ball for 9 X 10^-3 seconds du

Average Velocity of a Bird's Flight

A bird flies north at 20 m/s for 30 seconds. It rests for 18 seconds and then flies east at 25 m/s for 32 seconds. Find the average velocity for the entire trip and the direction headed.

Particle Completing a Revolution

A charged particle with a charge-to-mass ratio of q/m = 6.0E8 C/kg travels on a circular path that is perpendicular to a magnetic field whose magnitude is 0.71 T. How much time does it take for the particle to complete one revolution? Answer in seconds.

Disk Angular Velocity

Please see attachments. ans. A)Wbd = 4.38 rad/sec curving down; Vd = .306 m/sec up. B) Wbd = 0; Vd = 1.05 m/sec down. C) Wbd = 4.38 rad/sec curving up; Vd = .306 m/sec down.

Impact Restitution Velocity

Please see attachments to view the question. I am not too sure what calculations I need to perform in order to get the right value.

Questions

Please see the attached files for full problem description. (Note weight is pounds force not pounds mass) Given that, Maximum Allowable impulsive force = 0.8 lb. Sec, and asked you to calculate what' s the max velocity that can be achieved through this force

Projectile motion

Please see the attachment. Please use very basic physics on this. Like the range equation, not mgh or kinetic or potential energy. Thanks.

Two-dimensional motion

In two-dimensional motion, such as projectile motion, we can write the acceleration as: a=gj (this is vector j) This implies what about the velocity and displacement of the projectile?

Components of Vectors

An airplane flies at 65 meters per second in a direction 149 degrees counterclockwise from east. What are the east and north components of the plane's velocity? The book's answer is: -200 m/s for its east velocity and 120 m/s for its north velocity. Can you confirm whether this is correct and show its solution? The book does

Magnetic Field: Force on a particle of charge

A particle of charge 6e enters a region containing a magnetic field with a velocity of 7.5 X 105 m/s that is perpendicular to the field. There is a force on the particle of 6.84 X 10-13 N. Find the magnetic field T.

Circular Motion and gravitational attraction

1. If a car goes around a curve at half the speed, the centripetal force on the car is... a.) twice as big. b.) four times as big. c.) half as big. d.) one-fourth as big. 2. What is the gravitational force between two trucks, each with a mass of 2.0 x 10^4 kg, that are 2.0 m apart? 3. The gravitational

Physics problems involving sound waves

Physics questions The expression given below represents a transverse harmonic wave travelling along a string which is stretched along the horizontal x-axis. The expression yields the transverse wave displacement y in metres when x is entered in metres and the time t in seconds. For 1 mark each, answer the following q