Physics

c. Before space travel some people thought rockets would not work in space because there was noatmosphere for the rocket exhaust to push against. Explain the error in this thinking using Newton'sthird law.
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From an apple tree 2 metres high, a 100g mass apple fell of the tree, what work did it do?
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A piece of metal has a volume of 2.0 x 10-5 m3.The density of the metal is 8.0 x 103 kg/m3.What is its mass?A. 2.5 103 kgB.4.0 x 102 kgC.1.6 101 kgD.1.6 x 105 kg
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A 50 kg mass is sitting on a frictionless surface. An unknown constant force called force A pushes the mass for 2 seconds until the mass reaches a velocity of 3 m/s. If the 50 kg mass is now pushed by an unknown force B and reaches the velocity of 3 m/s in 4 seconds, compare the impulse delivered to the mass when acted upon by force A with the impulse delivered to the mass when acted on by force B? *A) The impulse delivered to the mass when acted upon by force A is greaterB) The impulse delivered to the mass when acted upon by force B is greaterC) The impulse is the same in each caseD) We need to know the value of force A and force B in order to determine this
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list the 5 components of fitness
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A 1000 kg truck moving at 2.0 m/s runs into a concrete wall. It takes 0.5 s for the truck to completely stop. What is the magnitude of force exerted on the truck during the collision?
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Shrill sound is of -------------- *Higher frequencyLower frequencyHigher amplitudeLower amplitude
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a car is traveling north on the interstate. They cover 645 miles in 9 hours. What is the car's average velocity ?
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Two rocks of masses 5 kg and 10 kg a dropped from rest from a height of 20 m above ground. Ignore all friction and air resistance. Just beforethey hit the ground, which statement is true about the rocks?(A) The value for the acceleration of the 5 kg rock is the same as the value for the 10 kg rock, but their velocity values are different.(B) The values for the acceleration and velocity of the 5 kg rock are greater than the values for the 10 kg rock.(C) The values for the acceleration and velocity of the 5 kg rock are less than the values for the 10 kg rock.(D) The values for the acceleration and velocity of the 5 kg rock are the same as the values for the 10 kg rock.
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What might Earth be like if it had never been hit by the theoretical protoplanet Orpheus?
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The following problem applies to questions 8 and 9: a glass window acquires a net negative charge on its surface after being cleaned. Particles of dust, which are usually charged positively, start accelerating toward the window. If a particle travels a distance of 1 meter before reaching the window, in a time duration of 10 sec, and if the mass of the particle is 1 micro-gram and the charge on the particle is 10-12 Coulomb, then the magnitude of the electric field intensity is Group of answer choices
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Which is NOT an example of evidence that shows a chemical reaction occurred? change in color change in temperature change in shape bubbles, fizzing
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What is the objects average acceleration between 0.0 s and 5.0 s? ANSWER FAST! PLEASEE
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A 5 kg object is moving downward at a velocity of 12 m/s and iscurrently 2.6 meters above the ground. calculate its kinetic energycalculate its potential energycalculate its mechanical energy
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What is the main reason for running one experiment that has an independent variable and running one variable with everything the same except that it does not have the independent variable?
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1. What is matter?2. What are the three phases of matter? 3. Describe how gas particles move.4. What is temperature? 5. The slower the particles, the ______________ the temperature. 6. A change in temperature causes what? 7. What is the difference between boiling and evaporation? 8. What is sublimation? 9. Name the three ways thermal energy is transferred. 10. Sunburn is an example of what? 11. Give an example of convection. 12. What is conduction? 13. What is the difference between conductors and insulators?
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what is tangential velocity
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Classify each substance as either a conductor or insulator.A sample of mercury: conductorA piece of glass: insulatorA rubber hose: insulatorA negatively ionized lithium paste: conductor
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(Cr(NH3).](Co(CN)6) is a coordination complexcompound. What is the percent composition of carbon in thiscompound?
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What occurs as a ray of light passes fromal inilo water?
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What is the difference in the speed of the generator with a small magnet and a generator with a large magnet?
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The Bill and Melinda Gates Foundation hires you as a consultant to determine how best to use $20 billion to save the world and make it a better place to live. You cannot spend $1 on yourself or your family. Whats your plan? Who would you help? What would you do?
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Which law best describes this behavior of gases in the Sun?
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4. Name three examples of "concentrated" forms of energy.
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