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What is the magnitude of the apparent weight of a 69 kg astronaut 3500 km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.8 m/s^2 ?
A thermos contains 143 cm3 of coffee at 90 C. To cool the coffee you drop 2 13.0-g ice cubes into the thermos. The ice cubes are initially at 0 C and melt completely. What is the final temperature o
Two cars lost in a blinding snow storm are traveling across a large field, each thinking they are on the road. They collide. If the distance x is 161 meters and the car on the left is travelling at
The circular top of a can of soda has a radius of 0.018 m. The pull-tab has an area of 2.03 10-4m2. The absolute pressure of the carbon dioxide in the can is 1.4 105Pa. Find the force that this gas
An airtight box has a removable lid of area 1.1 10-2m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 0.75 105Pa. The inside of the box is completely
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 2.2 1028 kg and 2.0 103 m. (a) Find the density of such a star.
What was the upward force of the air resistance while the coffee filter was falling at terminal speed?
It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 2.00 s and comes to rest. What does the spring scale regis
460 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process. At what
A coffee filter of mass 1.1 grams dropped from a height of 4 m reaches the ground with a speed of 0.9 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter?
A 12-pack of Omni-Cola (mass 4.30 kg}) is initially at rest on a horizontal floor. It is then pushed in a straight line for 1.20 {m} by a trained dog who exerts a horizontal force with magnitude 36.
A 500 g model rocket is on a cart that is rolling to the right at a speed of 3.0 m/s. The rocket engine, when it is fired, exerts an 8.0 N thrust on the rocket. Your goal is to have the rocket pass
A hotel elevator ascends 170m with a maximum speed of 4.1m/s . Its acceleration and deceleration both have a magnitude of 1.2m/s^2.How far does the elevator move while accelerating to full speed fro
A woman is running at a constant velocity of 5 m/s in an attempt to catch a stopped bus 11m ahead of her. However, it pulls away from her with a constant acceleration of 1m/s2. How much time does it
A glaucous-winged gull, ascending straight upward at 5.40 , drops a shell when it is 11.0 above the ground. What is the magnitude of the shell's acceleration just after it is released? What is the d
What is the minimum coefficient of friction between tires and road that will allow cars to take the turn without sliding off the road? (Assume the cars do not have negative lift.)
30-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 230 J from 460 J. How high does she rise during this i
What is the acceleration of a 3.0-kg bucket being lowered into a 10-m-deep well, starting from the top with the tension of the rope being 9.8-N
A copper-bottomed kettle, its bottom 24 cm in diameter and 3.0 mm thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800 W. What is t
A typical ten-pound car wheel has a moment of inertia of about 0.35kgm^2. The wheel rotates about the axle at a constant angular speed making 40.0 full revolutions in a time interval of 5.00 .
A loudspeaker of mass 15.0 is suspended a distance of = 2.20 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 2.70.
An electron moves with a horizontal velocity 3.0x 10^6m/s of as it enters a deflector inside a TV tube. The electron strikes the screen after traveling 17 cm horizontally and 40 cm vertically upward
They want to dock, which means they have to arrive at the same position at the same time with zero velocity. a) What should the initial velocity of the second spacecraft be?
Find the magnitude and direction of the force Fw. Express the direction as an angle with respect to due east.
Two blocks connected by a string and tied to a wall, with θ = 29°. The mass of the lower block is m = 1.2 kg; the mass of the upper block is 2.0 kg.(a) Find the tension in the string conne