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A swimming pool 1.4 m by 0.6 m has a uniform depth of 2.0 m?
What is the total force on the bottom of the pool N (downward)
What is the absolute pressure at the bottom of the pool? N/m2
What will be the pressure against the side of the pool at the bottom?
N/m2
1 AnswerPhysics1 decade agoA hydraulic lift is used to jack a 1120 kg car 12 cm off the floor.?
The diameter of the output piston is 18 cm, and the input force is 250 N.
(a) What is the area of the input piston?
m2
(b) What is the work done in lifting the car 12 cm?
J
(c) If the input piston moves 13 cm in each stroke, how high does the car move up for each stroke?
m
(d) How many strokes are required to jack the car up 12 cm? (Include fractions of a stroke in your answer).
(e) Calculate the combined work input of all of the strokes.
J
2 AnswersPhysics1 decade agoYou win a lottery prize consisting of all the gold you can put into a backpack?
The backpack dimensions are 50 cm 21 cm 15 cm. What is the weight of this gold in pounds?
lb
1 AnswerPhysics1 decade agoThe teach pushes tangentially on a hand-driven merry-go-round and is able to accelerate it from rest?
The frequency is 15 rpm in 9.0 s. Assume the merry-go-round is a uniform disk of radius 1.5 m and has a mass of 1000 kg, and two children (each with a mass of 20 kg) sit opposite each other on the edge. Calculate the torque required to produce the acceleration, neglecting frictional torque.
m·N
What force is required at the edge?
N
3 AnswersPhysics1 decade agoJack and Jill are riding on a merry-go-round.?
Jack is a distance R from the center of the merry-go-round and Jill is a distance 2.1 R from the center.
(a) What is the ratio of Jack angular speed to Jill angular speed?
(b) What is the ratio of Jack's linear speed to Jill's linear speed?
(c) What is the ratio of Jack's centripetal acceleration to Jill's centripetal acceleration?
1 AnswerPhysics1 decade agoThe wheels on a truck have a radius of 17.0 cm.?
The wheels on a truck have a radius of 17.0 cm. When the wagon is moving at a speed of 3.7 m/s, what is the angular speed of the wheels?
rad/s
1 AnswerPhysics1 decade agoA big wheel is rotating at a speed of 5000 rpm when it is turned off?
It slows to a speed of 800 rpm in 5.0 s. (Consider speeding up as positive and slowing down as negative.)
(a) What was the average angular acceleration of the machine.
rad/s2
(b) If the angular acceleration were constant, how many complete revolutions did the wheel make in this time.
rev
1 AnswerPhysics1 decade agoA Wheel with an initial angular speed of 6.70 rad/s rotates 12.9 revolutions as it is slowing down and stoppin?
What was the angular acceleration of the wheel? Slowing is positive
(b) How much time did this wheel rotate before stopping?
s
2 AnswersPhysics1 decade agoA Dad pushes tangentially on a hand-driven merry-go-round and is able to accelerate it?
He spins it from rest to a frequency of 15 rpm in 9.0 s. Assume the merry-go-round is a uniform disk of radius 1.5 m and has a mass of 1000 kg, and two children (each with a mass of 20 kg) sit opposite each other on the edge. Calculate the torque required to produce the acceleration, neglecting frictional torque.
m·N
What force is required at the edge?
N
3 AnswersPhysics1 decade agoA ball with a mass of 580 g is moving straight up with a speed of 28 m/s?
when it hits Tinkerbell who is hovering motionless directly above the ball. Tinkerbell grabs the ball, quits flapping her wings, and rides on the ball until it reaches its maximum height. If Tinkerbell has a mass of 860 g, how high abver Tinkerbell's original position does she and the ball rise, neglecting air resistance?
m
2 AnswersPhysics1 decade agoA 0.230-kg ball is moving to the right with a speed of 6.00 m/s when it collides head-on with a stationary bal?
After this collision, which is elastic, the incoming ball travels to the left with a speed of 3.70 m/s.
(a) What is the speed of the ball that was initially stationary after the collision? (Take the positive direction as to the right.)
m/s
(b) What is the mass of that ball?
kg
1 AnswerPhysics1 decade agoA uniform board of wood is 4.50 m long and has a mass of 8.00 kg.?
he board is supported by two stacks of bricks, one 0.54 m from the left end and the other 1.19 m from its right end. A child with a mass of 15 kg, walks from the center of the board toward the right end. How close to the right end of the board can the child walk before it begins to tip?
m
1 AnswerPhysics1 decade agoA 44.0 g arrow is shot horizontally with a speed of 25.8 m/s when it hits a target with a mass of 0.480-kg.?
The arrow passes completely through the target and exits with a speed of 9.1 m/s.
a) If the target is at rest when hit, what is its speed after the arrow exits?
m/s
(b) How much energy is lost as heat in this scenario?
J
2 AnswersPhysics1 decade agoA tennis ball with a mass of 57 grams has an initial velocity of 6.5 m/s at an angle of 74° from the vertical.?
The ball bounces off the ground with the same speed and at the same angle as it had initially. What impulse was applied to the ball?
kg · m/s
1 AnswerPhysics1 decade agoWhile standing on a frozen lake you push a small child (with a mass of m2) away from you (with a mass of m1)?
If the child has twice the kinetic energy of you, what is the ratio of your masses?
m1/m2 =
1 AnswerPhysics1 decade agoA 0.230-kg ball is moving to the right with a speed of 6.00 m/s when it collides head-on with a stationary bal?
After this collision, which is elastic, the incoming ball travels to the left with a speed of 3.70 m/s.
(a) What is the speed of the ball that was initially stationary after the collision? (Take the positive direction as to the right.)
m/s
(b) What is the mass of that ball?
kg
2 AnswersPhysics1 decade agof you hold a 0.990-kg box with your arm extended a distance of 0.665 m from the shoulder joint?
what torque does the box exert about that joint?
(a) when the arm is held horizontal?
N · m
(b) when the arm is held at an angle of 19.5° below the horizontal?
N · m
1 AnswerPhysics1 decade agoA sign with a weight of 220 N is supported by a uniform 110 N beam?
Find the tension in the wire supporting the sign.
? N
Find the horizontal force and the vertical force exerted by the hinge on the beam.
horizontal ? N
vertical ? N
1 AnswerPhysics1 decade agoA tennis ball with a mass of 57 grams has an initial velocity of 6.5 m/s at an angle of 74° from the vertical.?
The ball bounces off the ground with the same speed and at the same angle as it had initially. What impulse was applied to the ball?
kg · m/s
1 AnswerPhysics1 decade agoA 0.190-kg ball is dropped from rest.?
If the magnitude of the ball's momentum is 0.710 kg · m/s just before it lands on the ground, from what height was it dropped?
m
4 AnswersPhysics1 decade ago