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a) How can a rocket change direction when it is far out inspace and is essentially in a vacum?
b) A bungee jumper momentarily comes to a rest at the bottom of the dive before they spring back upward. At that moment,describe the bungee jumpers velocity, acceleration,and whether ornot they are in equilibrum?
c) Suppose that a grandfather clock( a simple pendulum device) is running slowly . The time it take to complete each cycleis lomger than it should be. should one shorten or lenghten thependulum to make the clock keep the correct time? .Why?
A 100 ball of clay is thrown horizontally with a speed of 9m/s toward a 900 block resting on a frictionless surface. It hits the block and sticks. The clay exerts a constant force on the block during the 7 ms it takes the clay to come to a rest re..
A refrigerator has a 1000 W compressor, but the compressor runs only 20% of the time, If electricity costs $0.10/kWh, what is the monthly (30 day) cost of running the refrigerator
A glass sheet 1.40 ?m (micrometer) thick is suspended in air. Calculate the minimum value of the index of refraction of the glass sheet that produces this effect
A heat of 4.3*10^6KJ is req to convert a block of ice at -15deg C into water at 15deg C. What is mass of ice
A certain camera has f-numbers that range from 1.1 to 28. If the focal length of the lens is 40 mm, what is the range of aperture diameters for the camera
An inductor is to be made by wrapping wires around a paper tube of radius 0.702 cm and length 8.44 cm. How many turns will give the inductor an inductance of 6.000e-3 H
Consider a series circuit in which the capacitive reactance equals the inductive reactance. what is the phase angle between current and voltage
An air mass has a temperature of 68F and 970hPa with a mixing ratio of 5 g/kg. Without any condensation or mixing the air mass now has a temperature of 50F and a pressure of 750hPa. Find the initial and final values of a) r, b) T(dew), and c) vapor p..
A string is wound tightly around a fixed pulley whose radius is 5.0 cm. As the string is pulled the pulley rotates without slipping. What is the angular speed of the pulley
Sit on a rotating chair. Slowly twist your body in one direction and after that rapidly twist it in the other. What is going to happen? Is angular momentum conserved and if not why.
convert 25mus into ams bmihthe kinetic energy of a car of mass m moving with velocity vis emv22. if m1000kg and v6ms
t a point 11km deep in the ocean, the pressure is 1.13e8Pa. Find the density of water at the bottom of the ocean
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