An attacker at the base of a castle wall 4.00m high throws a rock straight up with a speed of 4.00 m/s from a height of 1.65m above the ground.
a)will the rock reach the top of the wall?
b)if so, what is it's speed at the top? if not, what initial speed must it have to reach the top?
c)find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 4.00m/s and moving between the same two points
d)does the change in speed of the downward moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations?
e)explain physically why it does or doesn't agree.
Answers: 3
Physics, 22.06.2019 05:00, eshaesmot12345
Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s
Answers: 1
Physics, 22.06.2019 12:00, angelamirga332
Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.
Answers: 1
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