Explore BrainMass

Conservation of Energy

Elastic collision of blocks

Two blocks are free to slide along a frictionless wooden track ABC as shown in Figure (see attachment). A block of mass m1 = 4.95 kg is released from A. Protruding from its front end is the north pole of a strong magnet, repelling the north pole of an identical magnet embedded in the back end of the block of mass m2 = 9.00 kg, i

Inelastic central collisions

Take g= 9.8 m/s^2. A 0.5 kg ball moving at 12 m/s collides centrally with a 0.25 kg ball moving in the opposite direction at 18 m/s. If the collision is inelastic and the balls stick together after colliding find: 1) the common velocity after impact, 2) the loss in kinetic energy in the collision, and 3) what forms d

Mechanics: Conservation of energy, falling mass on spring.

7-58. An 80.0kg man jumps from a height of 2.50m onto a platform mounted on springs. As the springs compress, the platform is pushed down a maximum distance of 0.240m below its initial position, and then it rebounds. The platform and springs have negligible mass. A) What is the man's speed at the instant the platform is depresse

Rotational Motion: conservation of angular momentum, energy.

Two astronauts (Fig.), each having a mass of 70.0 kg, are connected by a 11.0 m rope of negligible mass. They are isolated in space, orbiting their center of mass at speeds of 4.70 m/s. (a) Treating the astronauts as particles, calculate the magnitude of the angular momentum. (b) Calculate the rotational energy of the syst

Conservation of Energy: Block Falling on a Spring

The green block is falling at a speed of 29 m/s and is 14 meters above the spring. The spring constant is 4000 N/m, To the nearest tenth of a cm how far is the spring compressed? To the nearest hundredth of a meter, to what height will the block rise after it hits and leaves the spring?

Conservation of Energy: Breaking of the Pendulum String

A 1.91 kg ball is attached to the bottom end of a length of fish line with a breaking strength of 8 lb (35.6 N). The top end of the fishing line is held stationary. The ball is released from rest with the line taut and horizontal ( = 90.0°). At what angle (measured from the vertical) will the fish line break?

Conservation of Energy: Spring Block on an Incline

An object of mass m starts from rest and slides a distance d down a frictionless incline of angle. While sliding, it contacts an unstressed spring of negligible mass as shown in Figure. The object slides an additional distance x as it is brought momentarily to rest by compression of the spring (of force constant k). Find the in

Conservation of Energy and Ramps

A truck of mass m has a brake failure while going down an icy mountain road with downward slope angle a. Initially the truck is moving downhill at speed V(0). After careening downhill a distance L with negligible friction, the truck driver steers the runaway vehicle onto a runaway truck ramp of constant upward slope angle B. The

3 problems related to work done and conservation of energy are solved.

(See attached files for full problem description with units and diagrams --- The figure is the velocity-versus-time graph for a 3.90 object moving along the x-axis. Determine the work done on the object during each of the five intervals AB, BC, CD, DE, and EF. --- Part A Use work and energy to find the speed of the 2.

Conservation of Energy

A metal can containing condensed mushroom soup has mass 220 g, height 11.2 cm and diameter 6.38 cm. It is placed at rest on its side at the top of a 3.00 m long incline that is at 26.0° to the horizontal, and is then released to roll straight down. Assuming mechanical energy conservation, calculate the moment of inertia of the

Compression and Speed of Spring

Please assist me with the attached 10 exam review problems. Compression and speed of spring, acceleration of gravity, tension in a tightrope, speed of a wave

Physics: Work and energy, linear momentum, and rotational motion

Problem1: A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (the mass of the carbon atom is 12 times that of the neutron.) what fraction of the neutron's kinetic energy is transferred to tha carbon atom? (express your answer in percent) Problem2: A 1400kg rocket sled at re

Charged Spheres and Charges on a Line

1) The figure shows 3 pairs of identical spheres that are to be touched together and then separated. The initial charges on them are indicated. Rank the pairs according to (a) the magnitude of the charge transferred during touching and (b) the charge left on the positively charged sphere, greatest first. The picture s

Inelastic coliision momentum

2. [SJ3 8.P.047.] Tarzan, whose mass is 75.0 kg, swings from a 3.00 m vine that is horizontal when he starts. At the bottom of his arc, he picks up 55.0 kg Jane in a perfectly inelastic collision. What is the height of the highest tree limb they can reach on their upward swing?

Conservation of linear momentum

A 0.300 kg puck, initially at rest on a horizontal, frictionless surface, is struck by a 0.200 kg puck moving initially along the x axis with a speed of 2.00 m/s. After the collision, the 0.200 kg puck has a speed of 1.00 m/s at an angle of = 54.0° to the positive x axis (Fig. 8.10). Figure 8.10. (a) Determine the speed

Law of conservation of energy

You (A) are in a sledge sliding down an inclined plane. (Friction is neglected). An observer (B) at the foot of the plane looks at your initial position at the top of the slide and sees your energy as potential energy (mgh). You (A) slide down to the bottom of the plane and have a velocity of V0 . So the observer sees mgh

Relativity and the Law of Conservation of Energy

You (A) are in a sledge sliding down an inclined plane. (Friction is neglected). An observer (B) at the foot of the plane looks at your initial position at the top of the slide and sees your energy as potential energy (mgh). You (A) slide down to the bottom of the plane and have a velocity of V0. So, the observer sees mgh = m

Determine the Angular Velocity and Final Temperature

1) A boxer is struck by an opponent causing him to rotate about a vertical axis with an angular velocity of one revolution per second while his arms are extend horizontally with a 12-kg glove on each hand. He drops his hands to his sides hoping that the increase in angular velocity will cause the next blow to glance off him. If

Conservation of Potential Energy due to Gravity

Two baseballs, each with a mass of 0.122 kg, are separated by a distance of 950 m in outer space. If the balls are released from rest, what speed (in m/s) do they have when their separation has decreased to 370 m? Ignore the gravitational effects from any other objects.

Finding a Spring Constant

Assuming negligible friction, what spring constant would be needed by the spring in a "b-b gun" to fire a 10g pellet to a height of 100m if the spring is initially compressed 10cm?

Conservation of Energy in a Roller Coaster

Suppose the roller coaster in Fig. 8-29 (attached) (h1 = 32 m, h2 = 13 m, h3 = 20) passes point A with a speed of 3.00 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point B? The distance traveled is 55.0 m.

Conservation of Energy in a Sliding Block

A 2.0 kg block slides along a horizontal surface with a coefficient of friction µk = 0.30. The block has a speed of v = 1.2 m/s when it strikes a massless spring head-on (as in Fig. 8-18). (a) If the spring has a force constant k = 120 N/m, how far is the spring compressed? (b) What minimum value of the coefficient of s

Conservation of Energy of Pendulum Bob and Its Speed

A simple pendulum has a length of 0.75 m and a bob whose mass is 0.15 kg. The bob is released from an angle of 25 degrees relative to a vertical reference line. a) Show that the vertical height of the bob when it is released is h=L(1-cos25 degrees). b) What is the kinetic energy of the bob when the string is at an angle of 9.0 d

Conservation of Mechanical Energy

A black of mass m=750g is released from rest and slides down a frictionless track of height h=55.2cm. At the bottom of the track the block slides freely along a horizontal table until it hits a spring attached to a heavy, immovable wall. The spring compressed by 2.64cm at the maximum compression. What is the value of the spring

Energy - Speed

A 58 kg skier is coasting down a 25 degree slope. A kinetic frictional force of 70-N opposes her motion. Her initial speed is 3.6 m/s at the top of the slope. Ignoring air resistance, determine her speed at a point located 57m down the slope.

Shooting the Breeze

Please do not place your response in a .pdf or .cdx format, but Word documents are okay. Thanks! Please see attached for actual problem. Note that I only need help with the last part of this problem! PSS 6.1: Shooting the Breeze Learning Goal: To practice Problem-Solving Strategy 6.1 for projectile motion problems. A stu

Bullet Collision Momentum

A 12.0-g rifle bullet is fired with a speed of 380 m/s into a ballistic pendulum with with mass 6.00 kg, suspended from a cord 70.0 cm long. Compute the vertical height through which the pendulum rises. Compute the initial kinetic energy of the bullet. Compute the kinetic energy of the bullet and pendulum immediately after the b