Tucker

A 700 gram block is released from a height h above an ideal spring of spring constant 400 N/m. The block sticks to the spring, and comes momentarily to rest after compressing the spring by an amount of 19 cm.

(a) What is the value of the initial height h?

i got 0.88 m but its wrong

(b) What is the height of the block when it again comes to rest momentarily--the block remains connected to the spring? Measure from the equilibrium position of the spring.

i got 0.17 m but it says its wrong

A 700 gram block is released from a height h above an ideal spring of spring constant 400 N/m. The block sticks to the spring, and comes momentarily to rest after compressing the spring by an amount of 19 cm.

(a) What is the value of the initial height h? 

i got 0.88 m but its wrong

(b) What is the height of the block when it again comes to rest momentarily--the block remains connected to the spring? Measure from the equilibrium position of the spring.

i got 0.17 m but it says its wrong

A cart with mass 350 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass.

After the collision, the first cart reverses its original direction with final speed of 0.59 m/s.(a) Now what is the mass of the second cart?(b) Now what is the speed of the second cart after impact?

A mass of 60 kg is held 1.80 x10^7 metres above the surface of a planet that has a radius of 3.75 x10^7 metres and a mass of 4.50 x10^28 kg.

a) If the mass were to be dropped freely to hit the surface of the planet, with what velocity would it collide with the planet? _____m/s       

b) How much work would be required to lift it 7.00 x10^6 m from its original point 1.80x 10^7 m above the ground? _____J

c) What would the escape velocity be from the surface of the planet to reach deep space? _____m/s

d) If a giant spring with k=1.90 x10^9 N/m were compressed by 20 m and the mass were shot straight up into space:

i) Ignoring the effect of the change in gravitational potential energy, what would the velocity of the mass be as it left the spring?______

ii) How high would the mass be flung?______

A roller coaster (425. kg) moves from A (5.00 m above the ground) to B (18.0 m above the ground). Two nonconservative forces are present: friction does -2.00 x10^4 J of work on the car, and a chain mechanism does +3.00 x 10^4 J of work to help the car up a long climb. What is the change in the car's kinetic energy, ΔKE = KEf - KE0, from A to B?

 ______J

A mass of 60 kg is held 1.80 x10^7 metres above the surface of a planet that has a radius of 3.75 x10^7 metres and a mass of 4.50 x10^28 kg.

a) If the mass were to be dropped freely to hit the surface of the planet, with what velocity would it collide with the planet? _____m/sb) How much work would be required to lift it 7.00  x10^6 m from its original point 1.80x 10^7 m above the ground? _____Jc) What would the escape velocity be from the surface of the planet to reach deep space? _____m/sd) If a giant spring with k=1.90 x10^9 N/m were compressed by 20 m and the mass were shot straight up into space:i) Ignoring the effect of the change in gravitational potential energy, what would the velocity of the mass be as it left the spring?______ii) How high would the mass be flung?

______

A 700 gram block is released from a height h above an ideal spring of spring constant 400 N/m. The block sticks to the spring, and comes momentarily to rest after compressing the spring by an amount of 19 cm.

(a) What is the value of the initial height h?

(b) What is the height of the block when it again comes to rest momentarily--the block remains connected to the spring? Measure from the equilibrium position of the spring.

show work please :)

show work please :)

a) 2cscB

b) 2/sinb

c) tanB

d) cotB

show work please :)

show work please :)

solve for θ, [0,2pi] 

2cos2θ +1=0?show work please

show work please

I got cosθ^2    

is this correct?

A satellite orbits a planet at a distance of 3.00x10^8 m. Assume that this distance is between the centers of the planet and the satellite and that the mass of the planet is 6.58x10^24 kg. Find the period for the satellite's motion around the planet. Express the answer in earth days.