A physicist, upon awaking one morning to find his stove out of order, decides to boil the water for his wife's coffee by shaking it in a thermos flask. Suppose that he uses 380 cm3 of tap water at 58°F, that the water falls 1.15 ft each shake, and that the physicist completes 32 shakes each...
A metal container, which has a mass of 9.0 kg contains 17.6 kg of water. A 2.0-kg piece of the same metal, initially at a temperature of 200.0°C, is dropped into the water. The container and the water initially have a temperature of 15.1°C and the final temperature of the entire system is...
A lead ball, with an initial temperature of 25 °C, is released from a height of 106.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature in °C of the ball after it hits. (You do not need to enter the units.) Data...
Two people pull on a horizontal spring that is attached to an immovable wall. Then, they detach it from the wall and pull on opposite ends of the horizontal spring. They pull just as hard in each case. In which situation, if either, does the spring stretch more?
I think that the spring would...
-- A person is hanging motionless from a vertical rop over a swimming pool. She let's go of the rope and drops straight down. After letting go, is it possible for her to curl into a ball and start spinning? Justify your answer....is there going to be angular velocity? will that allow her to...
The five masses below all have the same radius and a cylindrically symmetric mass distribution. They start to roll down an inclined plane, starting from rest, at the same time and from the same height. Give their order of arrival at the bottom.
Icm=684 g*cm2, M = 47g
Icm=373 g*cm2, M =...
In an Atwood machine, one block has a mass of M1 = 490 g and the other has a mass of M2 = 290 g. The frictionless pulley has a radius of 5.1 cm. When released from rest, the heavier block moves down 65 cm in 1.15 s (no slippage).
What is the tension T1?
Find the pulley's moment of...
Wheel A of radius ra = 14.6 cm is coupled by belt B to wheel C of radius rc = 28.8 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 7.1 rad/s2. At what time will wheel C reach a rotational speed of 240.7 rev/min, assuming the belt does not slip?
I did...
Starting from rest at t = 0 s, a wheel undergoes a constant angular acceleration. When t = 1.9 s, the angular velocity of the wheel is 6.2 rad/s. The acceleration continues until t = 15 s, when the acceleration abruptly changes to 0 rad/s2. Through what angle does the wheel rotate in the...
1) The Earth rotates once per day about its axis. Where on the Earth's surface should you stand in order to have the smallest possible tangential speed?
would it be on the top of axis since it will not move?
2) It is possible, but not very practical, to build a clock in which the tips of the...
Find the speed of a satellite in a circular orbit around the Earth with a radius 2.93 times the mean radius of the Earth; RE= 6.37·103 km ME= 5.98·1024 kg
Suppose that the coefficients of static and kinetic friction have values such that the static coefficient is twice the value of the kinetic coefficient for a crate in contact with a cement floor. Does this mean that the magnitude of the static frictional force acting on the crate at rest would...
:confused: I am having trouble answering this question...what is the answer?! HELP
Suppose you are in an elevator that is moving upward with a constant velocity. A scale inside the elevator shows your weight to be 600 N. (a) Does the scale register a value that is greater than, less than...
HW Help!
I have no idea how to answer these questions!:confused:
1) Newton's second law indicates that when a net force acts on an object, it must accelerate. Does this mean that when two or more forces are applied to an object simultaneously, it must accleerate? Explain.
2) A father...