Three identical very dense masses of 4300 kg each are placed on the x axis. One mass is at x1 = -120 cm , one is at the origin, and one is at x2 = 400 cm .

Part A

What is the magnitude of the net gravitational force Fgrav on the mass at the origin due to the other two masses?

Take the gravitational constant to be G = 6.67×10⁻¹¹ N⋅m2/kg2 .

Express your answer in Newtons.

From t = 0 to t = 3.30 min, a man stands still, and from t = 3.30 min to t = 6.60 min, he walks briskly in a straight line at a constant speed of 2.67 m/s. What are (a) his average velocity vavg and (b) his average acceleration aavg in the time interval 1.00 min to 4.30 min? What are (c) vavg and (d) aavg in the time interval 2.00 min to 5.30 min?

A blood flow meter measures a potential difference of 9.0

A satellite has a mass of 6255 kg and is in a circular orbit 4.30 × 105 m above the surface of a planet. The period of the orbit is 2.2 hours. The radius of the planet is 4.49 × 106 m. What would be the true weight of the satellite if it were at rest on the planet’s surface?

A 0.770-kg mass attached to a vertical spring of force constant 147 N/m oscillates with a maximum speed of 0.322 m/s. Calculate the period related to the motion of the mass. Calculate the amplitude. Calculate the maximum magnitude of the acceleration.

Four identical metallic objects carry the following charges: +1.10, +6.12, -4.28, and -9.19C. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many electrons (or protons) make up the final charge on each object?

1. A box slides down a frictionless incline and a hoop, uniform disk and a solid sphere all roll down another incline of exactly the same length and height.  They all have the same mass and start out from rest at the same time.  Rank the objects: box, hoop, disk and sphere in the order they reach the bottom of the ramp.  If any reach the bottom at the same time, state that explicitly.  

Reaches first ______     ______             ______             ______ Reaches bottom last

need a MLA format the movie matrix in 1999 work cited.

Ball 1, with a mass of 100g and traveling at 12.0m/s , collides head on with ball 2, which has a mass of 340gand is initially at rest.

A. What are final velocities of each ball if the collision is perfectly elastic? (v_fx)₁ , (v_fx)₂

B. What are final velocities of each ball if the collision is perfectly inelastic?

A solid disk with r = 1m and M = 1kg falls from unwinding string (as in a primitive yo-yo).

(a) use conservation of energy to find linear speed v once the disk lowers by h = 50cm.

(b) from h = v2/2a find the linear acceleration a

(c) find α, the angular acceleration

While taking photographs in Death Valley on a day when the temperature is 62.0

Sunspots are cooler than the surrounding region of the Suns surface True or False

The Sun is a main-sequence star  True or False

All stars are made primarily of hydrogen and helium at birth : True or False

The distance to nearby stars can be measured by parallax   True or False

It is impossible to measure stellar mass in binary systems   True or False

Stars near the lower right of the main sequence are lower in mass and have longer lifetimes than stars further up the main sequence : True or F

High mass stars die in supernovae explosion: tRUE OF False

Pulsars are rotating neutron stars with magnetic fields : True or False

A white dwarf is supported by electron degeneracy pressure : True or False

You push a block of mass 24kg up a frictionless ramp that makes an angle 0.4189rad as measured from horizontal. Immediately after the block leaves your hands it has a velocity of magnitude 11m/s. The block travels up the ramp, reaches its highest point, and heads back down the ramp.

When is the magnitude of the block's acceleration the greatest?

a) On its way up the ramp.

b) On its way down the ramp.

c) At its highest point.

d) The magnitude of the net force on the block is constant throughout its motion.

A 0.500 kg hammer is moving horizontally at 6.50 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board.
(a) Calculate the duration of the impact in seconds. 
(b) Calculate the impulse imparted. 
(c) What was the average force exerted on the nail?

(a) 0.00308 s   (b) 6.25 kg.m/s    (c) 6055 N

(a) 0.30342 s   (b) 3.25 kg.m/s    (c) 1055 N

(a) 0.00308 s   (b) 3.25 kg.m/s    (c) 1655 N

(a) 0.00308 s   (b) 3.25 kg.m/s    (c) 1055 N

(a) 0.00308 s   (b) 1.25 kg.m/s    (c) 1055 N

 A thin block of soft wood with a mass of 0.070 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.67 g is fired with a speed of 629 m/s at a block of wood and passes completely through it. The speed of the block is 25 m/s immediately after the bullet exits the block.
(a) Determine the speed of the bullet as it exits the block. 
(b) Determine the loss of kinetic energy of this system (block and bullet).

Question 3 options:

(a) 254 m/s    (b) 173 J

(a) 254 m/s    (b) 924J

(a) 654 m/s  (b) 751 J

(a) 254 m/s    (b) 751 J

(a) 466 m/s    (b) 751 J

A person with mass mp=80 kg is standing at rest on a horizontal, frictionless surface holding a ball of wet clay with mass mg=10 kg . In front of the person is a large block with mass M=20 kg at rest next to a spring with stiffness k=100 N/m . The person throws the ball horizontally, it sticks to the block, and then ball and block slide and compress the spring a distance 1=0.75 m away from equilibrium before the ball-block springs back toward the person. (Assume the distance the ball is thrown is short, so that we can ignore the vertical component of its velocity.)

a) Draw the following moments in time with the given labels: At t=0, the person is holding the ball and all objects are rest. At t=1 the ball has left the person's hands. At t=2 the ball and block move together with speed V2. At t=3; the ball and block have fully compressed the spring. At t=4 the ball and block are sliding back toward the person, At t=5 the person, the ball, and the block are all moving together, HINT: Include a coordinate system! Remember that momentum is a VECTOR and energy is a SCALAR.

b) Find V2 (the speed of the ball and the block just before they start compressing the spring)

c) Find VB. (the speed of the ball after it was thrown, but before it hits the block)

d) Find Vp (the speed of the person after the ball was thrown)

e) Find Vs (the speed at which the person, ball, and block move after the ball and block bounced back off the spring and collided with the person)

f) If it takes 0.2 seconds for the person and the ball-block to get to the same velocity, find the impulse on the person due to the ball-block. AND find the force on the person due to the ball-block,