Physics 10错题

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Question 4 0/ 1pts | Correct Answer What determines how fast an object rolls down a slope? Its moment of inertia All object rolls down a slope at the same rate Its size Its mass

Question 8 1/1pts An astronaut lands on a planet that has 2 times the mass as Earth and 3 times the diameter. How does the astronaut's weight differ from that on Earth? 2/3 times 4/9 times 2/9 times 4/3 times

Question 13 0/1pts Correct Answer If you hold one end of a metal nail against a piece of ice, the end in your hand soon becomes cold. Does cold flow from the ice to your hand? Yes, the heat flows from the ice to your hand. Yes, the cold flows from the ice to your hand. No, the cold flows from your hand to the ice. No, the heat flows from your hand to the ice.

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Question 16 1/1pts Two charges, one with +2 coulomb and the other with -1 coulomb, are placed 2 meters from each other. Assuming the +2 charge is at a fixed location, how much potential energy will be released if we let go of the -1 charge? Give your answer in terms of k, the Coulomb constant. 1/2 k 2k 4k 1k

Question 6 1/1pts Does centripetal force do work on a circularly moving object? It depends on the trajectory of the object. It depends on which way the centripetal force is pointing. Yes it does. No it does not.

Question 4 1/1pts In discussion, you have thought about why helicopters need a secondary smaller rotor blades on their tails. Here, calculate how fast the main body of the helicopter would be spinning if the smaller rotor blades are missing. Assume the moment of inertia of the big rotor blade is 1/100th of the main body and the rotor blade is spun up to 200 rpm from rest. Hint: The bigger the rpm is ; the faster something is spinning. 20rmp 2rpm i poivoia R 2000rmp correct answer. 200rmp

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Question 9 1/1pts In class we have discussed that if we swing a bucket vertically in a circular motion, the water won't fall out as long as it is swing fast enough. Let's calculate how fast it has to be. Assume the bucket is being swung on a circle with radius of 1 meter. Hint: Think of what is supplying the centripetal force right when the bucket is exactly upside down. (i.e. The case shown in slides of lecture 10.) Since the question asks for bare minimum speed, you can equate the force that is pointing downwards to the centripetal force. 1m/s 10m/s 3.16m/s Cannot calculate. It depends on how much water we are talking about. Question 10 1/1pts Earth is essentially a sphere with radius 6 million meters. Similar to how the water do not fall out of the bucket when going fast enough, any object on the surface of Earth can also "not fall" to the ground when it goes fast enough. This is usually refered to as an object orbiting Earth (e.g. Satellites and the Moon) You can assume the weight of the object is acting as the centripedal force. How fast does an object have to go at the surface of Earth before it is orbiting Earth? 3900m/s 7800m/s 1000m/s

Question 9 1/1pts Which of the following is false about Isotopes? They are atoms with the same atomic numbers. They are atoms with the same number of protons. They are atoms with the same number of neutrons. Isotopes behave similarly chemically.

Question 6 1/ 1pts How many types of atoms can you expect to find in a pure sample of any element? 2 types 1 type Depends on the element. Some have 1 and some have more.

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Question 4 1/1pts If our Sun shrank in size to become a black hole, would the gravitational force between the Sun and the Earth be affected? Would the orbit of Earth be affected? The gravitational force is the same but the orbit becomes half as big. The gravitational force is the same and the orbit is unaffected. The gravitational force is halved and the orbit becomes half as big.. The gravitational force is halved but the orbit is unaffected.

Question 2 1/1pts Calculate the force of gravity between Earth (mass = 6.0 X 1024 kg) and the Moon (mass = 7.4 X 1022 kg). The average Earth-Moon distance is 3.8 X 108 m. 3.1x107{30}N 7.8x107{28]N 2.1x10720}N 1.2x107M39IN

Question 3 1/1pts If the ALL the linear dimensions of a storage tank are reduced to half their former values, by how much does the overall surface area of the tank decrease? By how much does its volume decrease? 1/2 of it original surface area and 1/8 of it original volume 1/2 of it original surface area and 1/4 of it original volume 1/4 of it original surface area and 1/4 of it original volume 1/4 of it original surface area and 1/8 of it original volume

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Question 7 1/1pts A piece of iron placed on a block of wood makes it float lower in the water, If the iron were instead suspended beneath the wood, would it float as low, lower, or higher? The wood block would float lower because now the iron block is dragging it down. _ The wood block would float higher because now the iron block is also displacing water. The wood block would float at the same height because the weight is unchanged.

Question 8 1/1pts When the wooden block is placed in the beaker, what happens to the scale reading? The reading remains the same. RLUCECECIEREIET ER GERCET ) R (o] selercfi LOIEE LR A ) ERVEER G R I e VT The reading increase. The reading decrease.

Question 10 1/1pts A dike in Holland springs a leak through a hole of area 1 cm? at a depth of 2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? 20N 10N 1IN 2N

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Question 6 1/1pts A block of aluminum with a volume of 10 cm? is placed in a beaker of water filled to the brim. Water overflows. The same is done in another beaker with a 10 cm3 block of lead. Does the lead displace more, less, or the same amount of water? More water is displaced by the aluminum block because it has lower density. The same amount of water. The two blocks have the same volume. More water is displaced by the lead block because it has higher density.

Question 4 1/1pts Consider eight little spheres of mercury, each with a diameter of 1 mm. When they coalesce to form a single sphere, how big will it be? How does its surface area compare with the total surface area of the previous eight little spheres? 4 mm in diameter; double the original surface area 2 mm in diameter; double the original surface area 4 mm in diameter; half the original surface area 2 mm in diameter; half the original surface area

Question 2 1/1pts The force of the atmosphere at sea level against the outside of a 10 m? store window is about a million N. Why does this not shatter the window? The pressure is spread across the whole surface, making the force fairly small. The air pressures on both sides of the window are the same. So the net force on the window is zero. The windows are made to withstand that pressure.

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Question 5 1/1pts An old remedy for a pair of nested drinking glasses that stick together is to run water at different temperatures into the inner glass and over the surface of the outer glass. Which water should be hot, and which cold? Cold water for both glasses. Hot water for both glasses. Cold water for the inner glass and hot water for the outer glass. Hot water for the inner glass and cold water for the outer glass.

Question 9 1/1pts In which form of heat transfer is a medium not required? Super critical flow Conduction Convection Radiation

Question 11 1/1pts What is the voltage at the location of a 0.0001-C charge that has an electric potential energy of 0.5 J (both measured relative to the same reference point)? 5000 Volts 500 Volts 0.0002 Volts 0.002 Volts

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