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10.We want to slide a 12-kg box up a 2.5-m-long ramp inclined at
. A worker,
ignoring friction, calculates that he can do this by giving it an initial speed of 5 m/s
at the bottom and letting it go. But friction is not negligible; the box slides only 1.6
m up the ramp, stops, and slides back down.
a. Find the magnitude of the friction force acting on the crate, assuming that it is
constant.
A force of 5 N to is required to compress an industrial spring by 0.0001 meters, how much force
is required to compress this spring by 0.0003 meters?
block of mass 2.25 kg starts out at the rest at the top of 15.0 m long plane inclined 30° with horizontal .a)what is its initial gravitational potential energy.? as.it slides down the plane,the block encounters.frictional force at 3.5n. b)how much work is done to overcome.friction. c)what is the kinetic energy of the block when it reaches the bottom od the incline?at a distance of .5m from the bottom of the inclined plane is horizontal.spring of the force constant 52n/m. suppose that the coefficient of kinetic friction between the block and the horizontal surface is 0.15? d)what is the kinetic energy of the block just before it comes in contact with the spring? e)by how much will the springbe compressed? f)what is the work done against friction as the block moves along the horizontal surface? is
. You joined a “dogsled” race during your winter break. To start, you
pulled the sled (total mass of 85 kg) with a force of 650N at 50° above
the horizontal. Find the work done on the sled after it moves at a
distance of 800cm. (Round to 2 decimal places)
The length of an iron bar is 1.9m. the distance of the hand twisting the bar from the support is 1.6m. The distance of the force applied on the rock to be twisted is 0.3m. How much force is applied on the rock if the tensional force is 450N.
A Christmas ball in a shape of hollow sphere is hung from the tree by a piece of
tread attached to the surface of the ball. The mass and radius of the ball are
0.105 kg and 0.12 m, respectively. What will be its period of oscillation when
slightly displaced from its equilibrium position? Hint:
𝐼 = 5
3 𝑚𝑟2
A vertical spring has a force constant of 125 N/m. By how much will the
spring be compressed if a mass of 0.525 kg is placed on top of it?
It takes 365.25 days for Earth to complete one revolution around the sun.
Calculate the (a) period, (b) frequency, (c) angular frequency of Earth as it
revolves around the sun.
Scientists once postulated the existence of a planet called Vulcan to explain
Mercury’s precession. Vulcan is supposed to be between Mercury and the sun
with the solar distance equal to 2/3 that of mercury. What would be its supposed
period?
NASA is expected to send a 2600-kg satellite 450 km above the earth’s surface.
(a) What is its radius?
(b) What speed will it have?
(c) What is its orbital period?
(d) What is its radial acceleration?
