Mechanics | Relativity Answers

A spring (k=250N/m) keeps a 2.9kg mass stationary on a frictionless 70 degree slope. How much is the string stretched? If mass was moved so that the stretch in the spring was changed to 15cm. What would be the acceleration of the mass?

The force required to stretch a Hooke's-Law spring varies from 0 N to 44.4 N as we stretch the spring by moving one end 18 cm from its unstressed position.
Find the force constant of the spring.
Answer in units of N/m.

An oil drop of mass 10-12 gm is floating on the free surface of a liquid. At any instant the position of the drop can be determined within the error of 10-4 cm. what will be the error in measurement of its velocity.

For a filter to efficiently screen out particles depend on four factors, name those factors.

Describe the energy exchange that occur as clock spring unwinds.

State the energy transformation that occur when a car is brought to rest by its break.

Electric blender is under which energy technology? Discuss

There are many well-documented cases of people surviving falls from heights greater than 20.0 m. In one such case, a 55.0 kg woman survived a fall from a 10th floor balcony, 29.0 m above the ground, onto the garden below, where the soil had been turned in preparation for planting. Because of the "give" in the soil, which the woman compressed a distance of 15.0 cm upon impact, she survived the fall and was only briefly hospitalized.
a. Ignoring air resistance, what was her impact speed with the ground (in m/s)?
b. What was the magnitude of her deceleration during the impact in terms of g?
c. Assuming a constant acceleration, what was the time interval (in s) during which the soil brought her to a stop?
d. What was the magnitude of the impulse (in N · s) felt by the woman during impact?
e. What was the magnitude of the average force (in N) felt by the woman during impact?

A 5kg block and a 3kg block are connected by a string which hangs over a pulley.
a) How much weight does the 5 kg block have?
b) How much weight does the 3 kg block have?
c) How much weight is not balanced?
d) How much mass will be moved by this unbalanced force?
e) What acceleration will develop?
f) How much force acts in the string where it is tied to the 3 kg block?
g) How much force acts in the string where it is tied to the 5 kg block?

1) A spring connected to a mass of 0.15 kg has a period of oscillation of 0.408 seconds. What is spring constant?
2) A spring with a force constant of 45.5 N/m oscillates with a period of 0.908 seconds. What mass must be attached to the spring?
3) A spring with a force constant of 44.5 N/m is connected to a mass m. If the period of oscillation is 1.094 s, what is the mass?