Explore BrainMass


Determine the distance when the ball is struck again

A ball of mass 150 g is fired from a smooth 30 degree incline at an angle theta with the incline as shown in the figure in the attachment. The initial velocity of the ball is v0 = 10 m/s. It travels after struck by the ground with the velocity v2 as shown. If the coefficient of restitution between ball and ground is 0.75, determ

Force and work, Work-Energy Theorem, Gravitational Energy, Conservation

Conceptual Questions: **Please consider significant figures and if possible, draw visual graphics** Two forces F1 and F2 are acting on the box showing in the drawing (sorry, I don't know how to draw the angle θ between the 2 lines!), causing the box to move across the floor. The two force vectors are drawn to scale. Which fo

motion of projectile

Please see attached form. Show all work. 1. An object is thrown vertically upward with an initial velocity v0. At the highest point in the object's trajectory: a. its velocity and acceleration are both zero. b. its velocity and acceleration are both nonzero. c. its velocity is zeor, and its acceleration is nonzero and dire

Velocity of a bullet

A gun fired straight upward. The bullet leaves the gun at 100 ft per second (time =0) After 2 seconds the velocity of the bullet is 36 ft per second. There is a linear equation that gives the velocity v in terms of the time t. Find the equation and find the velocity after 3 seconds.

find momentum absorbed by wall after struck by ball

A tennis ball with a mass of 0.50 kg is thrown at a wall at a speed of 20 m/s. The ball hits the wall perpendicularly and bounces off in an elastic collision. a) How much momentum does the wall absorb when struck by the tennis ball? b) A tennis serving machine shoots tennis balls at the wall, as described above, at a rate

Velocity and Acceleration of a Freely Falling Ball

I constructed a fairly simple experiment related to curvlinear motion. The experiment involved a small metal ball that rolls off a table and lands on the floor. I used the edge of table as the Y direction. I timed the trial run from the of the edge of the table and when the ball hits the floor. I know X (total of all time thr

Finding velocity and kinetic energy of hockey player

Hockey player A has a mass of 104 kg, initial velocity of 37 km/h N skating towards player B. Hockey player B has a mass of 86 kg, initial velocity of 0 (not moving). After body check, Player A has a final velocity of 15 km/h, 35 degrees W of North. What is final velocity of Player B after the collison? What is the kinet

Terminal velocity of pilot; ideal pulley; pop gun's spring

1. In 1955 a pilot fell 370 meters without his parachute opening. He landed in a snowbank, making a crater 1.1 meters deep. He walked away with minor injuries. If his mass was 80 kg and his terminal velocity was 35 m/s, calculate a) the work done on him by the snow b) the average force exerted on him by the snow c) the wor

Create an experiment that relates to curvilinear motion

I need help with a simple experiment. I'm trying to create an experiment that relates to curvilinear motion. However, I'm unsure how to set up an experiment and show all the calculations. Can someone help me with creating a simple experiment to show what curvilinear motion is and do those calculations I can make up the data

Physics: Potential energy to stop or slow a Proton

Part 1 A proton has an initial speed of 4.09E+5 m/s. What potential difference is required to bring the proton to rest? Part 2 What potential difference is required to reduce the initial speed of the proton by a factor of 4? Part 3 What potential difference is required to reduce the initial kinetic energy of th

Mechanics: Problems and Solutions

1. A projectile of mass 0.6 kg is fired vertically upwards in the barrel of a gun by a vertical net propelling force of 50 N acting over a period of 0.5 seconds. Calculate: (a) The velocity of the projectile when it leaves the gun. (b) The height reached by the projectile. (c) The time taken from the projectile leavin

Distances of Two Sound Sources

See attached .gif file. As the drawing shows, one microphone is located at the origin, and a second microphone is located on the +y axis. The microphones are separated by a distance of D = 1.25 m. A source of sound is located on the +x axis, its distances from microphones 1 and 2 being L1 and L2, respectively. The speed of so

Stress in the Bones of the Arm during the Swing

1. Find an equation for the terminal velocity of a sphere falling through a viscous fluid (like water or blood). How does the terminal velocity scale with the size of the falling object? Assume that the density of that object is much larger than that of the fluid through which it falls (neglect buoyancy). a. V ~ L^-3 b. V ~

Speed and motion of bowling ball for each impulse

See attached file. A 8.0 kg bowling ball is rolling down the alley with a velocity of 2.9 m/s. For each impulse, a and b, as shown in Figure 9-3, find the resulting speed and direction of motion of the bowling ball. _________m/s in the same direction or in the opposite direction? _________ m/s

Physics Collision Problem

A 1430 kg car moving north at 27.0 m/s collides with a 2165 kg car moving east at 13.0 m/s. They stick together. In what direction and with what speed do they move after the collision? ____ ° north of east ____ m/s.

Car crashes into a barrier, impulse needed to stop the child

A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 19 kg child in the car. Assume that the child's velocity is changed by the same amount as the car's in the same time period. (a) What is the impulse needed to stop the child? N·s (b) What is the average force on the child? N (c) What is

Electric turntable

An electric turntable 0.750 m in diameter is rotating about a fixed axis with an initial angular speed of 0.250 rev/s and a constant angular acceleration of 0.900 rev/s2. (a) Compute the angular velocity (in rad/s) of the turntable after 0.200 s. (b) Through how many revolutions have the turntable spun during this time

A toy car runs off the edge of a table

A toy car runs off the edge of a table that is 1.350 m high. The car lands 0.405 m from the base of the table. (a) How long did it take the car to fall? _______s (b) How fast was the car going on the table? _______ m/s

Find Weight, Force, Magnitude, Friction

You push a 330 N trunk up a 20.0° inclined plane at a constant velocity by exerting a 220 N force parallel to the plane's surface. (a) What is the component of the trunk's weight parallel to the plane? ________ N (b) What is the sum of all forces parallel to the plane's surface? _______ N (c) What is the magnitude and dir

Projectile motion: Example question

An athlete executing a long jump leaves the ground at a 30.8° angle and travels 7.61 m with a take-off speed of 9.21 m/s. If this speed were increased by just 4.1%, how much longer would the jump be?

Horizontal projectile motion: how long in the air, distance, magnitude, velocity

A projectile is fired horizontally from a gun that is 51.0 m above flat ground, emerging from the gun with a speed of 110 m/s. (a) How long does the projectile remain in the air? (b) At what horizontal distance from the firing point does it strike the ground? (c) What is the magnitude of the vertical component of its vel

Physics Questions: Force, Work and Energy

Physical science (8th edition) by Bill W. Tillery Parallel Exercises 1. How much work is done when a force of 800.0 Ni s exerted while pushing a crate across a level floor for a distance of 1.5m? 2. A force of 400.0 N is exerted on a 1,250 N car while moving it a distance of 3.0 m. How much work was done on the car?

Determining Average Speed: Example Problem

You travel from point A to point B and back again. You travel back and forth using the identical path. Your average speed going from A to B is v1 and your average speed from B to A is v2. In term of v1 and v2 only, what is your average speed for the entire trip back and forth?


1. A 4.5 kg block is at rest on a table when it is attached to a second mass, m2 hanging over a pulley. The static coefficient of friction between the block and the table is 0.56 and kinetic coefficient is 0.42, respectively. The hanging mass, m2 is chosen to be 2.4 kg. a) Will this choice for m2 set the system in motion? b)

Velocity of water at the bottom of Niagara Falls

Q.2. Water in the Niagara River approaches the falls at a velocity of 8km/hr. Niagara Falls is approximately 55 m high. Neglecting air resistance, estimate the velocity of the water at the bottom of the falls. (Note: This problem can be solved using at least two different definitions of the system, bonus points will be given

Physics - Throwing a rock over a cliff

The problem reads: A rock is thrown downwards from the edge of a cliff. If the initial speed is 15 m/s downward, how far does the rock travel down from the edge after 5 seconds? I know that g = 9.8 meters/second^2.

Physics: Velocity, Magnitude and Direction

Hi, I need some assistance with the following questions: 1. A cannon ball is fired with a velocity of 48 m/s at 42 degrees up from the horizontal. Assume that it lands at the same level as it was fired from. a. Find the maximum height of the cannon ball. b. Find the total time the cannon ball is in the air. c. Find the

9 Physics Problems and Solutions

1. To qualify for the finals of a racing event, a race car must achieve an average speed of 220 km/h on a track with a total length of 2400 m. If a particular car covers the first 1000 m of the track with an average speed of 180 km/h, what minimum average speed must it have on the remainder of the track to qualify? 3. How lon

Physics: Vertical Average in total and by segment

Time, t Distance, d (s) (m) 0.00 0.00 0.25 0.250 0.50 0.500 0.75 0.750 1.00 1.00 1.25 1.143 1.50 1.248 1.75 1.352 2.00 1.455 2.25 1.559 2.50 1.662 2.75 1.766 3.00 1.870 3.25 1.973 3.50 2.077 3.75 2.180 4.00 2.284 How do I find the vertical Average, and then the vertical average of each segment?