energy or the sled + load compare to the original kinetic energy of the sled? a.
ID: 1438927 • Letter: E
Question
energy or the sled + load compare to the original kinetic energy of the sled? a. it is 1/4 the original kinetic energy b. it is 1/2 the original kinetic energy c. it is 3/4 the original kinetic energy d. it is the same as the original e. I have no idea, since 1 did not read the book or pay attention in class that day 15. An object is suspended from the ceiling of an elevator that is descending at a constant space The tension in the string holding the object is a. equal to the weight of the object b. less than the weight of the object but not zero c. greater than the weight of the object d. zero e. can't tell, not enough information given 16. A block sliding on a frictionless table is attached to a string that passes through a hole in the Initially, the block is sliding with a speed v_0 in a circle of radius r_0. A student under the table slowly on the string. What happens as the block spirals inward? a. its energy and angular momentum arc conserved b. its angular momentum is conserved, and its energy increase c. its angular momentum is conserved, and its energy decreases d. its energy is conserved, and its angular momentum increases e. its energy is conserved, and its angular momentum decreases 17. Two stones are thrown with the same initial speed at the same instant from the roof of a full stone is thrown at an angle of 30degree above the horizontal; the other is thrown horizontally. What following is true? a. the stones strike the ground at the same time and with equal speeds b. the stones strike the ground at the name time amd with different speeds c. the stones strike the ground at different times and with equal speeds d. the stones strike the ground it different times e. none of the above statements are trueExplanation / Answer
15 . Tension would be equal to weight of object.
16.
17initially the objects have the exact same kinetic and potential energy because they are both thrown with the same kinetic energy and at the same heights. Conservation of energy tells us that if they both have the same energy at the beginning, they'll have the same energy at the ground if they both land at the same height. Remember, if the object is fired upwards, it will be continuously exchanging kinetic energy for potential energy thus losing speed as it goes higher and higher until it reaches the top of it's trajectory and then begins falling. At that point, it begins exchanging potential energy for kinetic energy and begins gaining speed.
So c is correct
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