I need help answering this test review with the work to get the answers. Thank y

Question

I need help answering this test review with the work to get the answers. Thank you.

QUESTION 1

A meterstick is balanced on a fulcrum at its center. Then a 73 N weight is placed 27 cm to the left of center. How many cm to the right of center would a 98 N weight need to be placed in order to balance the system?

QUESTION 2

A 4-meter plank weighing 7 kg is lying on a dock with 3.02 meters of its length on the dock, and the rest of its length extending off the dock. If a child weighing 38 kg walks out onto the part of the plank extending off the dock, what is the maximum distance in meters that the child can walk on the plank from the edge of the dock before he falls into the water?

QUESTION 3

A baseball pitcher throws a 148 g baseball at a velocity of 66 m/s towards home plate. The batter hits the ball, and the velocity of the ball coming off the bat is 26 m/s in the opposite direction of the velocity of the pitch. The bat is in contact with the ball for 0.002 seconds. What is the magnitude in Newtons of the average force applied to the ball?

QUESTION 4

A man pulls a 18-kg sled 51 meters along an angled hill with a force of 66 N, which elevates the man 30 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 51 meter path, during which a 301 N frictional force acts upon his sled. How much work in Joules does the man do pulling the sled up the hill?

QUESTION 5

A man pulls a 82-kg sled 50 meters along an angled hill with a force of 21 N, which elevates the man 30 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 50 meter path, during which a 301 N frictional force acts upon his sled. How much work in Joules does the man do on the sled in pulling the sled up the hill?

QUESTION 6

A man pulls a 20-kg sled 35 meters along an angled hill with a force of 250 N, which elevates the man 32 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 35 meter path, during which a 30 N frictional force acts upon his sled. How much work in Joules does the man do against friction in pulling the sled up the hill?

QUESTION 7

A 93-kg man pulls a 60-kg sled 92 meters along an angled hill with a force of 76 N, which elevates the man 31 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 92 meter path, during which a 295 N frictional force acts upon his sled. What is the velocity in m/s of the man on the sled right as he reaches the bottom of the hill?

QUESTION 8

A motor spins a disk (Idisk = 24.1 kg*m2) with a torque of 39 N*m, and a 18 N frictional force acts on the disk at a radius of 1.6 m. Attached to the disk at a radius of 44 m is a 40 kg mass. What is the moment of inertia of the system?

QUESTION 9

A motor spins a disk (Idisk = 25.9 kg*m2) with a torque of 39 N*m, and a 18 N frictional force acts on the disk at a radius of 1.3 m. Attached to the disk at a radius of 27 m is a 73 kg mass. What is the magnitude of the net torque in N*m of the system?

QUESTION 10

A motor spins a disk (Idisk = 25.9 kg*m2) with a torque of 38 N*m, and a 19 N frictional force acts on the disk at a radius of 1.3 m. Attached to the disk at a radius of 2.5 m is a 9 kg mass. What is the magnitude of the angular acceleration in rad/s2 of the system?

QUESTION 11

A 5 kg ball travelling to the right at 8 m/s collides with a 3 kg ball at rest. After the collision, the 3 kg ball is travelling to the right at 10 m/s, and the 5 kg ball is traveling to the right at 2 m/s. Is this an elastic collision?

Yes
No

QUESTION 12

A 6 kg ball travelling to the right at 10 m/s collides with a 4 kg ball at rest. After the collision, the 4 kg ball is travelling to the right at 9 m/s, and the 6 kg ball is traveling to the right at 4 m/s. Is this an elastic collision?

Yes
No

QUESTION 13

A 74 kg ball traveling to the right at 61 m/s collides with a 51 kg ball at rest. After the collision, the 51 kg ball is traveling to the right at 68 m/s. What is the velocity of the ball on the left after the collision?

QUESTION 14

A 93 kg mass is separated from a 33 kg mass by 8 meters. What is the magnitude of the gravitational force in Newtons on the 93 kg mass?

QUESTION 15

A 80 kg object is in a circular orbit around a 29 kg object at a distance of 7 meters. What is the magnitude of the tangential velocity in m/s of the 80-kg object in its orbit?

QUESTION 16

A 93-kg projectile is fired from level ground. The vertical component of the initial velocity is 80 m/s and the horizontal component is 74 m/s. Ignore air resistance and the curvature of the earth in this problem. How far in meters does the projectile travel horizontally?

QUESTION 17

1,549 cg = _____ kg

QUESTION 18

3,635 cm3 = ______ m3

QUESTION 19

If one platter of lasagna uses 1.7 cups of tomato sauce, how many cups of tomato sauce will 7 platters of lasagna require?

QUESTION 20

A sprinter runs 81 meters in 5 seconds. What is his average speed?

QUESTION 21

A unicorn running on a beach at 6 m/s changes speed at a constant rate of 2.5 m/s2 over a period of 1 seconds. What distance did the unicorn travel during this process?

QUESTION 22

In a fit, a toddler throws straight down his favorite 1 kg toy with an initial velocity of 2 m/s. What is the magnitude of the velocity in m/s of the toy when it strikes the ground 0.1 seconds later?

QUESTION 23

A 55-kg woman in an elevator is accelerating downward at a rate of 1.4 m/s2. What is the magnitude of the force exerted by the elevator floor on the woman's feet?

QUESTION 24

Two people play tug of war. The 103-kg person on the left pulls with 1,034 N, and the 72-kg person on the right pulls with 846 N. Assume that neither person releases their grip on the rope with either hand at any time, assume that the rope is always taut, and assume that the rope does not stretch. What is the magnitude of the tension in the rope in Newtons?

QUESTION 25

A 108-kg box on the right and a 46-kg box on the left are tied together by a horizontal cable. The 108-kg box is acted upon by an external force of 581 N to the right. The frictional force exerted by the floor on the 108-kg box is 30 N and the frictional force exerted by the floor on the 46-kg box is 12 N. What is the magnitude of the tension in the connecting cable?

Explanation / Answer

1. apply the condition of equilibrium that summation of all the forcesand torue should add up to zero

here ; 73*27 = 98*x

x = 20.11 cm

3.)

Force = change of momentum/ time

=6808 N

4.)

w = fx D

= 66x 51

= 3366 Joule

18)

1 m = 10^-2 cm

3653 cm^3 = 3653 x (10^-2)^3

= 3653x10^-6 m3 Answer

(5)

W = 21x 50

1050 Joule

6)

W= 30*35

= 1050 Joule

17)

1 cg =10^-5 Kg

22)

v = u+ gt

u = 2m/s

23)

F = m(g+a)

= 55(9.8+1.4)

= 616 N

24)

Tension =1034+846

1880 Newton

g = 9.8 ms2

t =0.1 sec

v = 2.98 m/s

1549 cg = 0.01549 kg

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