Need all answers please The observable universe is made up of _____ and _____. A

Question

Need all answers please The observable universe is made up of _____ and _____. Acceleration is always in the direction of the net _____. Work Evolves both _____ and _____. Prove which requires more work - (a) the lifting of a 50 pound sack a vertical distance of 10 feel, or (b) the lifting of a 25 pound sack a vertical distance of 20 feet? What is the KE of (a) a 1kg mass at rest? (b) a 1kg mass moving at a velocity of 20m/s? Given a_g = 9.8m/s^2, if I drop a lead ball from the roof of a building (making sure no one is below!): (a) How far will it travel in 3 seconds? (b). How fast will it be traveling after 3 seconds? A Radio Flyer wagon of mass 10 kg was moved 8m by applying a force of 25N by a rope making an angle of 45 degree to the horizontal. (a) How much work was done in order to move the wagon? (b) What it I did the same (just in the opposite direction) to move the wagon back to its original position. (c) What was the total work done? Using you a screwdriver, you try to remove a screw from a piece of furniture, but can't get it to turn. To increase the chances of success, you should use a screwdriver that (a) is longer, (b) is shorter, (c) has a narrower handle, or (d) has a wider handle. A constant net torque is applied to an object. Which one of the following will not be constant? (a) angular acceleration, (b) angular velocity, (c) moment of inertia, or (d) center of gravity.

Explanation / Answer

7. The observable universe is made up of protons, electrons and neutrons

8. Acceleration is always in the direction of net force

9. work involves both force and displacement

10. Work is force x displacement so more the displacement more is the work done. So the force and displacement are parallel so cos theta =1. (b) requires more work.

11. KE of the object at rest is zero, and the object moving is 100 Joules

12. Distance = 9.8 x 3= 29.4 meters. The speed will be 29.4 m/sec2

13. The work done due to the force application is 141 m (F.S cos(theta)). If it has to be moved back then same work has to be done if there is no slope or etc. and neglecting the effects of friction. Work done in the whole process is zero because the net displacement from initial to final is zero.

15. angular momentum will be a constant

Hope these answers help. Cheers.

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