6.a motor pulls an 800 kg roller coaster train to the top of a 75 m hill. what is the change in the potential energy of the cars? a.5.9 x 10 ⁵ j b.6.0 x 10 ⁴ j c.18 x 10 ⁴ j d.7.5 x 10 ⁵ j 7.friction converts kinetic energy to which form? a. potential energy b. mechanical energy c. non mechanical energy d. total energy 8.how much power does a crane need to lift a 200.0 kg mass at a speed of 2.300 m/s? a. 460w b. 1962w c. 4513w d. 6123w 9.if a 50.0 kg cheetah, initially at rest, runs 274 m north in 8.65 s, what is its momentum? a.31.7 kg m/s b.1584 kg m/s c.490.5 kg m/s d.118,500 kg m/s 10.what is the kinetic energy of a 0.005 kg raindrop that falls 250 m? a.4.9j b.1.25j c.8.3j d.5.6j
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Physics, 22.06.2019 07:30, bell777
30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve
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Physics, 22.06.2019 08:30, bazsinghnagoke
An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?
Answers: 1
Physics, 22.06.2019 16:30, sophiqdionacles1968
Using gravity, an elephant can pull a mouse towards it from the ground. true or false explain why. will give brainliest if answered fast and the best explanation
Answers: 2
Physics, 22.06.2019 16:50, justkevin1231
Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.
Answers: 3
6.a motor pulls an 800 kg roller coaster train to the top of a 75 m hill. what is the change in the...
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