Potpourri A fire hose held near the ground shoots water at a speed of 8.5 m/s....
- Potpourri
- A fire hose held near the ground shoots water at a speed of 8.5 m/s. At what two angles should the nozzle point so that the water lands 3.1 m away?
- Extreme sports enthusiasts have been known to jump off the top
of the Rachel Carson Bridge, a bridge of height 23 m in Pittsburgh.
Assume a jumper runs horizontally off the top of the bridge deck
with a speed of 3.0 m/s and enjoys a free fall until she is 17 m
above the river at which time she opens her parachute.
- How long is the jumper in free fall?
- It is important to be as far away from the bridge as possible before opening the parachute. How far from the bridge is the jumper when she opens her chute?
- An Olympic long jumper is capable of jumping a distance of 630
m. Assuming his horizontal speed is 7.1 m/s when he leaves the
ground:
- How long is he in the air?
- How high does he go?
- What is the angle of his jump?
- Could he jump farther without changing his speed? Justify your answer.
Homework Answers
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Potpourri
A fire hose held near the ground shoots water at a speed of 8.5
m/s....
A fire hose held near the ground shoots water at a speed of 6.3 m/s. At...
A fire hose held near the ground shoots water at a speed of 6.3 m/s. At what angle(s) should the nozzle point in order that the water land 2.5 m away (see the figure(Figure 1))? Express your answer(s) using two significant figures. If there is more than one answer, separate them by a comma.
A fire hose held near the ground shoots water at a speed of...
A fire hose held near the ground shoots water at a speed of 6.0 m/s .Part AAt what angle(s) should the nozzle point in order that the water land 2.5 m away (see the figure(Figure 1))?Express your answer(s) using two significant figures. If there is more than one answer, separate them by a comma.
A fire hose held near the ground shoots water at a speed of 7.5 m/s
At what angle(s) should the nozzle point in order that the water would land 2.5 m away?(a) Smaller Angle(b) Larger Angle
Consider a bungee jumper dropping vertically in freefall from a bridge 80 m above the ground....
Consider a bungee jumper dropping vertically in freefall from a bridge 80 m above the ground. After three seconds, the elastic cord connecting the jumper to the bridge starts to stretch, which changes the jumper's acceleration to 15 m/s2 upwards. a) Sketch (without doing any math) the position vs time, velocity vs. time, and acceleration vs. time graphs for the bungee jumper from the moment they start to fall to the moment they reach the closest to the ground. b)...
A bungee jumper plans to bungee jump from a bridge 53.0 m above the ground. He...
A bungee jumper plans to bungee jump from a bridge 53.0 m above the ground. He plans to use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 12.0 m above the water. Model his body as a particle and the cord as having negligible mass and obeying Hooke's law. In a preliminary test he finds that when hanging at rest from a 5.00 m length of the cord, his body...
With solutions please. Thanks. 1)A base-jumper jumps off a stationary balloon at 6000 ft, free-falls for...
With solutions please.
Thanks.
1)A base-jumper jumps off a stationary balloon at 6000 ft, free-falls for 6 seconds at which point the parachute opens. After the chute opens, he decelerates to 18 ft/s in 3 seconds, and then drifts downwards at constant velocity to impact. Find maximum speed during this event. Hint: Break problem into three parts -free fall through deceleration after chute opening, and constant velocity b. Find total time. air where the object is accelerating downwards, motion. 2...
A paratrooper is initially falling downward at a speed of 27.9 m/s before her parachute opens....
A paratrooper is initially falling downward at a speed of 27.9 m/s before her parachute opens. When it opens, she experiences an upward instantaneous acceleration of 73 m/s2. (a) If this acceleration remained constant, how much time would be required to reduce the paratrooper's speed to a safe 5.20 m/s? (Actually the acceleration is not constant in this case, but the equations of constant acceleration provide an easy estimate.) (b) How far does the paratrooper fall during this time interval?
A paratrooper is initially falling downward at a speed of 29.1 m/s before her parachute opens....
A paratrooper is initially falling downward at a speed of 29.1 m/s before her parachute opens. When it opens, she experiences an upward instantaneous acceleration of 67 m/s2. (a) If this acceleration remained constant, how much time would be required to reduce the paratrooper's speed to a safe 5.50 m/s? (Actually the acceleration is not constant in this case, but the equations of constant acceleration provide an easy estimate.) (b) How far does the paratrooper fall during this time interval?
A parachutist bails out and freely falls 54 m. Then the parachute opens, and thereafter she...
A parachutist bails out and freely falls 54 m. Then the parachute opens, and thereafter she decelerates at 2.6 m/s2. She reaches the ground with a speed of 3.1 m/s. (a) How long is the parachutist in the air? (b) At what height does the fall begin?
(1) A ski jumper leaves a ski jump at a speed of 24 m/s at an...
(1) A ski jumper leaves a ski jump at a speed of 24 m/s at an angle of 30o. She ultimately lands 20 meters below where she left the jump. (a) What is her speed when she hits the ground? (b) What is her speed at the apex of her jump? (c) What is her speed at the height of 20m above the ground? I found part a to be 31 m/s but now I'm stuck and do not know...
A fire hose held near the ground shoots water at a speed of 6.3 m/s. At what angle(s) should the nozzle point in order that the water land 2.5 m away (see the figure(Figure 1))? Express your answer(s) using two significant figures. If there is more than one answer, separate them by a comma.
With solutions please.
Thanks.
1)A base-jumper jumps off a stationary balloon at 6000 ft, free-falls for 6 seconds at which point the parachute opens. After the chute opens, he decelerates to 18 ft/s in 3 seconds, and then drifts downwards at constant velocity to impact. Find maximum speed during this event. Hint: Break problem into three parts -free fall through deceleration after chute opening, and constant velocity b. Find total time. air where the object is accelerating downwards, motion. 2...
A paratrooper is initially falling downward at a speed of 27.9 m/s before her parachute opens. When it opens, she experiences an upward instantaneous acceleration of 73 m/s2. (a) If this acceleration remained constant, how much time would be required to reduce the paratrooper's speed to a safe 5.20 m/s? (Actually the acceleration is not constant in this case, but the equations of constant acceleration provide an easy estimate.) (b) How far does the paratrooper fall during this time interval?
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