Physics

Problem B: Shock Wave Escape (5 points)The star of a distant solar system explodes as a supernova. At the moment of the explosion, anresting exploration spaceship is 15 AU away from the shock wave. The shock wave of the explo-sion travels with 25000 km/s towards the spaceship. To save the crew, the spacecraft makes useof a special booster that uniformly accelerates at 150 m/s in the opposite direction. Determine if the crew manages to escape from the shock wave. (Neglect relativistic effects. )
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4. The speed of a d. C. Motor increases with increasing current through the armature coil. Given fixed supply voltage, two ways of changing the current supplied to the motor are: (1) a variable resistor (potentiometer) or (2) pulse width modulation (PWM). Explain how each method works. Provide one advantage and one disadvantage of each method
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what is the process that solar cells use to produce energy called?
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Jose conducted an experiment to measure the rate of minerals dissolving in water and changed the temperature of the water for each trial.What is the independent variable in this experiment?A: number of trials being testedB: temperature of the waterC: type of minerals used for each trialD: rate the minerals dissolved
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How far can you get away from your little brother (in meters) who has a squirt gun if you can travel at a speed of 3.0 m/s and you have 10.0 s before he sees you?
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Scenario: you are about to watch a movie youve been dying to see on hbo max. you pop some leftover spaghetti and water for some hot tea in the microwave. just as you pulled them out of the microwave and get ready to start the movie, you have the sudden urge to use the restroom. you give an eye roll and head to the restroom. predict which item (spaghetti or water) would be the coolest when you return. *you must use the cer format to answer question.
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Imagine conventional current running up the right, around and back down left side of a loop of wire. The magnetic field inside the loop of wire will be directed ______. a) out of the page. b) into the page. c) the fields will cancel each other out
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State the law of equipartition of energy in no more than 4 sentences.
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The speed of a light ray (f=5.09*10^14Hz) in corn oil is
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The pressure of water on ground is 50000pa and at first floor it is 20,000pa .find the height of the first floor??
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Which of the following is not considered a bloodborne pathogen
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A force compresses a bone by 1.0 mm. A second bone has the same cross-sectional area but twice the length as the first. By how much would the same force compress this second bone? 0.50 mm 0 1.0 mm 2.0 mm 4.0 mm 8.0 mm
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A cathode ray tube is made of glass with a small amount of some kind of gas in it. It has metal electrodes at each end to pick up an electric current. The electrodes are named "positive" and "negative. "
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A bolt of lightning discharges 9. 7 C in 8. 9 x 10^-5 s. What is the average current during the discharge?
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At t = 0 what are the two smallest positive values of x for which the probability function |(x,t)|2 is a maximum?
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what happens according to newton if you let an untide ballon go?
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When a wave reaches a surface, the new material absorbs all the energy of the wave.O TrueO False
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On a workday the average decibel level of abusy street is 69 dB, with 102 cars passing agiven point every minute. If the number of cars is reduced to 16 carsevery minute on a weekend, what is the deci-bel level of the street? Assume that sound in-tensity is proportional to the number of carspassing per minute. Answer in units of dB.
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Which of the rays drawn above would be correct as the light goes from the air into the water? (5 points) ABC
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In a coal plant, the coal is burned, converting its _____________________ into ___________________. the energy is then transferred from the burner to a boiler full of water. as the boiler turns the water into steam, it is converted into _________________________ which is used to turn the turbine. as the turbine turns the generator's magnets inside a wire, its _______________________ is converted into ______________________.
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(a) (i) The work function of caesium is 3.0 x 10-19 J. Explain what thisstatement means.(ii)[1]Calculate the frequency of radiation needed to eject electrons ofmaximum kinetic energy 6.0 x 10-19 J from a caesium surface. [2]
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You add 50 mL of water at 20C to 200 mL of water at 70C. What is the mostlikely final temperature of the mixture?OA. 60C B. 45CC. 30C D. 50C
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Day 581. Developing decision-making skills is a vital aspect that occurs during which stage of adolescent development?social developmentphysical developmentemotional developmentintellectual development4
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(a)(i) A galaxy moves away from the Earth at a speed of 3.9 104 km/s.The speed of light is 3.0 105 km/s.Light from the galaxy is emitted with a wavelength of 6.2 107 m.Calculate the change in the wavelength of the light that is received by an observer on the Earth.(ii) Calculate the wavelength of the light that is received by the observer on the Earth.(b)One of the pieces of evidence for the Big Bang theory is the red-shift of galaxies. Explain how the red-shift of galaxies supports the Big Bang theory.
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