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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 private helicopter flies 250 km west from city A to city B, then covers 100 km north from city B to city C. How far is it from city A to city C? What direction must the helicopter head to return straitly to city A from city C?
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 simple pendulum is found to vibrate 50 times within 200s. When 1.5 m of its
length is reduced to certain length, it vibrates 50 times in 175 s. Find the
original length of the pendulum.
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?
A basketball of mass 0.0400 kg is dropped from a height of 5.00 m to the
ground and bounces back to a height of 3.00 m.
a. On its way down, how much potential energy does the ball lose?
b. On its way back, how much potential energy does the ball regain
How much potential energy does a car gain if a crane lifts the car with a mass
of 1,500 kg and 20 m straight up?
