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To study in detail the surface of the moon, it is planned to put a geo-synchronous satellite in orbit about the moon. calculate the distance from the moons center that the satellite should be at so
What is the rate of energy loss in watts per square meter through a glass window 1.6 mm thick if the outside temperature is -8.3°F and the inside temperature is +84°F?
A 2.00-kg object moves with constant velocity 3.00 m/s toward the east. Two forces act on the object. The first is a 40.0 N force toward the west. What is the second force that acts on the object?
A ball is thrown at a 60.0° angle above the horizontal across level ground. It is released from a height of 2.00 m above the ground with a speed of 16.0 m/s. How long does the ball remain in the
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. How fast can she swim in still water?
The plane flies with an air speed of 120 m/s. If a constant wind blows at 10.0 m/s due west during the flight, what direction must the plane fly relative to the air to arrive at the destination?
A plane is headed eastward at a speed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is ?
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. What is the speed of the current?
Consider a two-loop standing wave on a string. If we increase the tension without changing the frequency, what kind of standing wave can we obtain?
Moving a charge from point A, where the potential is 380V, to point B, where the potential is 190 V, takes 4.1×10-4 J of work. What is the value of the charge?
what are the mass and speed (in the initial particle rest frame) of the second particle?
At relatively high temperatures nitrogen and oxygen more readily form a compound according to: N2(g) + O2 <-> 2NO(g). Calculate kp given that the initial pressures of nitrogen are 95 atm and 8
A 40.2 L constant-volume cylinder containing 2.21 mol He is heated until the pressure reaches 4.20 atm. What is the final temperature?
One hundred stones are placed on the ground 3 ft. apart, the first being 3 feet from a basket. If the basket and all of the stones are in a straight line, how far does a person travel who starts fro
A blue ball is thrown upward with an initial speed of 21.2 m/s, from a height of 0.5 meters above the ground. 2.6 seconds after the blue ball is thrown, a red ball is thrown down with an initial spe
Suppose a ball thrown downward with initial velocity 3 m/s instead of being dropped a) what then would be its position after 1s and 2s ?
The man and the daughter then carefully trade places. We will neglect any resistive forces between the boat and the water.
A 2 kg softball is pitched to you at 20 m/s. you hit the ball back along the same path and at the same speed. if the bat was in contact with the ball for .1 seconds, what is the magnitude of the ave
A 0.200-kg piece of aluminum that has a temperature of -163 °C is added to 1.1 kg of water that has a temperature of 1.8 °C. At equilibrium the temperature is 0 °C. Ignoring the containe
Question: Spring stretches by 0.0186 m when a 3.24-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 5.53 Hz?
If 61.5 L of oxygen at 18C and an absolute pressure of 2.45 atm are compressed to 48.8L and at the same time the temperature is raised to 56 degrees C, what will the new pressure be?
If all the oxygen as is removed from the mixture by reaction with phosphorus, which does not react directly with nitrogen, then the new pressure is 251 torr. Calculate (a) the partial pressure of ni
A 65 kg man in a 5.9 kg chair tilts back so that all his weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area of radius 0.9 cm. Find th
An electric-generator turbine spins at 3800 rpm. Friction is so small that it takes the turbine 23.0 min to coast to a stop. How many revolutions does it make while stopping?
A 70-kg astronaut is space-walking outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14