A rock thrown vertically upward from the surface of the moon at a velocity of 16m/sec reaches a height of s=16t-0.8t^2 meters in t sec. a. Find the rock's velocity and acceleration at time t. b. How long does it take the rock to reach its highest point? c. How high does the rock go? d. How long does it take the rock to reach half its maximum height? e. How long is the rock aloft? a. Find the rock's velocity at time t. v=16-1.6tm/s Find the rock's acceleration at time t. a=square m/s^2 (Simplify your answer. Use integers or decimals for any numbers in the expression.)

A weightlifter lifts an 120-kg barbell at a height of 2.4 meters above the ground. If it took 2.8 seconds to complete this lift, what was the weightlifter's power output in watts? Round to the nearest integer. square

Which object has the most inertia? ping pong ball feather bowling ball

What is the value of the normal force if the coefficient of kinetic friction is 0.22 and the kinetic frictional force is 40 newtons? A. 8.8 newtons B. 40 newtons C. 80 newtons D. 1.8times 10^2 8 x 10 newtons

8. What factor determines if lightning bolts are classified as hot or cold? A. lightning's temperature B. lightning's brightness C. likelihood of starting a fire D. amount of heat given off

4. What is the voltage drop across a shorted parallel component in a series-parallel circuit? A Zero volts B The applied voltage It depends on total current D It depends on total resistance

A stabilized spin is not different from a stall in any element other than Speed Rotation G force

What is the term for the base unit of temperature in the metric system? Fahrenheit degree (^circ F) Celsius degree (^circ C) C Kelvin unit (K) all of the above none of the above

What model states that particles of matter are always in motion?

Asample has a mass of 2.5 kg When the sample is suspended from the lower end of astring and totally immersed in water, the tension in the string is 11.2 N. What is the smallest density of a liquid in which the sample will float? Remember that rho _(water)=997kg/m^3 1838kg/m^3 1835kg/m^3 1828kg/m^3 1849kg/m^3

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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.