Physics, 02.09.2019 23:30 crysderria
Bill throws a tennis ball to his dog. he throws the ball at a speed of 15 m/s at an angle of 30° to the horizontal. assume he throws the ball from ground level.
a. if bill and his dog start in the same place, how fast should his dog run to intercept the ball exactly as it lands on the ground? (2 points)
b. how fast should the dog run to get to where the ball will be at a height of 2m as it falls back toward the ground, and to get there 0.5 seconds before the ball gets there? (hint: in this problem, you will need to consider both the x- and y-coordinates of the ball's position.) (1 point)
Answers: 2
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Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=
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Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?
Answers: 3
Bill throws a tennis ball to his dog. he throws the ball at a speed of 15 m/s at an angle of 30° to...
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