A ball with a mass of 5.0 g is moving at a speed of 2.0 m/s. Would doubling the mass or doubling the speed have a greater effect on the kinetic energy of the ball? Explain.

5. After: 30⁰ Before: 2 1 2 V' m₁ = 2 kg m₂ = 3kg h = 50 cm Mass 1 is released from rest from height hand slides down a frictionless 30° slope then collides with mass 2. The two masses then stick together and move as a unit on the horizontal ground. a. What is the speed of mass 1 at the bottom of the slope just before it hits mass 2? b. Mass 2 is initially at rest at the bottom of the slope. Mass 1 now collides with mass 2. Find the speed of the combined masses after the collision. c. How much energy was lost in this collision?

2) The sloth is one of the slowest creatures on Earth. Despite being slow, they are really good swimmers! How fast must the swim if they has a mass of 7.2 kg and 0.051 Joules of kinetic energy?

1.) A bowling ball is rolling along a bowling lane. If it rolls at twice the speed, then its: A) Momentum is twice as large 1)_ B) Energy is four times as large C) Both the above is true D) None of the above are true 2.) When a truck drives into a haystack, it doesn't get damaged. When it drives into a concrete wall, there is a lot of damage. Both cases have the same initial speed for the truck and the same final speed as well. What is the difference between these two cases? A) The initial momentum is less when it strikes the haystack. B) The impulse is less when striking the haystack C) The change in momentum is less when striking the haystack D) Force of impact is less when striking the haystack 2)

1. A 4.0 kg particle is moving at a velocity v = V2î – V2ĵ + 3k m/s. (a) (b) What is the particle's kinetic energy at this moment? What is the net work done on the particle if its velocity changes to - V2î + 3k m/s? V = - Assume that a force in the x y plane acts on the particle to slow it down (imagine (c) that this force is a type of friction). Will the particle's kinetic energy become zero under the influence of this force? Explain your answer.

A particle of mass m has a velocity of v = (v₂i + vj + v₂k). What is the correct expression for its kinetic energy? O a. O b. O c. O d. O e. m(v2i+vy²j + v₂²k)/2 None of these choices. m(vx2 + Vy² + V₂²)/2 m/2(2vx + 2Vy + 2V₂) m/2(2v,i + 2vj + 2v₂k)

2. A car moving east with a speed vo has kinetic energy Ko. If the same car moves west with a speed 2vo, its kinetic energy will be (a) Ko (b) 2Ko (c) -2Ko (d) 4Ko (e) -4Ko

Consider the table.   Vehicle 1 Vehicle 2 Vehicle 3 Vehicle 4 Mass (kg) 1000 2000 1000 2000 Velocity (m/s) 20 20 40 40 Kinetic energy (kJ) 200 400 800 1600 The table shows data collected for some vehicles on the road. What conclusion can be drawn about the relationship between mass, velocity, and kinetic energy?   Answer Choices: a. If only the mass of the vehicle doubles, the kinetic energy increases by a factor of four. b. If both the mass and the velocity of the vehicle double, the kinetic energy will increase by a factor of eight. c. If only the velocity of the vehicle doubles, the kinetic energy will double. d. If both the mass and the velocity of the vehicle double, the kinetic energy will increase by a factor of four.

An object is dropped from a height of 12m. At what height will its kinetic energy and its potential energy be equal? Explain your answer with proper equations and calculations.

C7 9.) If the orbit is elliptical, rather than circular, what can be said about the work done by the Sun on Earth? a.) It does not matter whether the orbit is circular or elliptical, no work is done. b.) The work the Sun does on Earth causes the tides.    c.) Whether the orbit is circular or elliptical, work must be done to propel Earth around the Sun. d.) If the orbit is elliptical, work is done to speed up or to slow down Earth, depending on its location in orbit. e.) The work the Sun does on Earth accounts for Earth's changes of season.