Speed and power can assist athletes in: Football Sprinting ) Baseball All of the above

2. A playground merry-go -round with a radius of 2.80 meters starts from rest, and is pushed so that it accelerates at a constant rate of -0.192rad/s^2 up until it reaches a maximum angular speed of 0.4rev/s a. How long (in seconds)does it take the merry-go-round to reach this maximum angular speed?[6 pts] b. Through how many radians has the merry-go-round turned during the time interval found in part a? [5 pts] c. In what direction is the merry-go-round spinning?Clockwise or counterclockwise? [2 pts] d. A23 kg kid is standing at the edge of the merry-go -round. What is the magnitude of their centripetal acceleration (inm/s^2) at the moment the merry-go-round reaches its maximum angular speed?[4 pts] e. What is the magnitude of the centripetal force (in N) acting on this kid at the moment the merry-go- round reaches its maximum angular speed? [4 pts] f. What is the direction of the centripetal force acting on this kid at the moment the merry.go-round reaches its maximum angular speed? Circle One. [2 pts] Tangent to the merry -go-round and pointing in the counterclockwise direction Tangent to the merry -go-round and pointing in the clockwise direction Radially inward Radially outward Unknown. Not enough information given. g. What is the magnitude of this kid's linear velocity (in m/s ) at the moment the merry-go-round reaches its maximum angular speed?[4 pts]

Sound travels faster in solids and liquids than in air faster in a vacuum than in air slower in warm air than in cold air faster in air than in water

atomic nuclei. Use the mass and size of a nucleon to calculate nuclear density. And once you have nuclear density,use that to find what the weight (in pounds) of a human body would be if it was made entirely of atomic nuclei without all the extra space taken up by the electron clouds. The radius of a nucleon is 1.2times 10^-15 meters and the volume of an average human is about 0.07m^3 In case you forgot, 1Newton=0.22lbs . Please show your full set up , steps, and work for credit.

What is the purpose of lightly applying the brakes with your left foot while moving through deep water? To test if your engine stalls To signal other drivers that you're in water To help generate heat and dry your brakes

What happens during the entire fusion process in the Sun?

Cold milk is poured into hot coffee. What happens to the heat energy of the coffee during the process? No heat energy moves between the two liquids. The coffee absorbs heat energy from the milk Ik (+Q coffee). +Q The coffee releases heat energy into the milk (-Q coffee).

Question 30 According to the shell model, which electrons play the most significant role in determining the properties of an atom? those in the outermost shell those in the innermost shell those in the shells between the innermost and outermost shells Electrons in every shell are just about equally important.

Which of the following is not true about the far side of the moon? Has light known as the highlands Has many craters It never receives sun light No large dark spots (maria) Powder like surface

Select the correct answer Susan makes a simple pendulum by attaching a rock to a piece of string that is 24.6 centimeters long. Then she swings it back and forth. What is the period of her simple pendulum? A. 1.32 seconds B. 0.99 seconds C. 9.81 seconds D. 2.43 seconds

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$\square $ Answer Bank KE: 1000.0 J PE: 3000.0 J KE: 0J $PE:4000.0J$ KE: 2000.0 J PE: 2000.0 J KE: 4000.0 J PE: 0J

Learning Log: How do you think you get something to have more kinetic energy?

If a UV light unit has four lamps in it, and each lamp is 7-watt, it is known as a __ 7-watt unit 28-watt unit 11-watt unit 3-watt unit

10. What is the mass of a meteorite that is traveling towards Earth at $1,760m/s$ with a momentum of $33,400kgm/s$

Where is the energy coming from in the lab (where does it start)? A Potential energy in the Cheeto B Potential energy in the water C Kinetic energy inside the water D Kinetic energy in the Cheeto

What should happen to the temperature of the water? A It stays the same B It goes down C It goes up

9. Your local weather report announces that the barometric pressure is 30.44 inHg. Convert this pressure to psi, atm torr, and Pa.

Express the temperature, 275.18 K in degrees Celsius. $548.33^{\circ }C$ $274.17^{\circ }C$ $2.03^{\circ }C$ $120.88^{\circ }C$ $22.78^{\circ }C$

Hubble's Law has led physicists and astronomers to the hypothesis that the universe is expanding. True False

Newton determined that the force of gravity on an object is proportional to its mass causing its mass to be canceled out (Newton's second law) and resulting in a constant acceleration. If the laws of physics are universal, then Newton should be able to apply his discoveries about gravity on Earth to the motion of the planets in our Solar System. Newton's third law says that for every force there is an equal reaction force in the opposite direction. What does this imply about the force of gravity associated with a person standing on the Earth? Choose one: A. The force of gravity on the person cancels out to zero. B. The Earth's gravity pulls downward on the person but also pushes upward on them. C. The Earth's gravity pulls downward on the person, and the person's gravity pulls upward on the Earth. D. There is twice as much gravitational force on the person than there would be if it weren't for Newton's third law.