# mssailormouth

Popular questions and responses by mssailormouth
1. ## Physics

Two people sitting on rolling chairs with little friction push off from each other so that they move apart. On is 60 kg and one is 40 kg. If the 40 kg person recoils at 4.3 m/s, what will the veloocity of the 60 kg person's recoil in m/s mivi=mfvf

2. ## Physics

An impulse of 15 Ns acts on a 0.2 kg ball initially at rest. What is the change in momentum? momentum =mV how do I get to V I am given m=0.2kg F=ma 15=0.2a a=75m/s do I need to time t next? i'm so lost :(

3. ## physics

An object with a kinetic energy of 50 J is stopped in a distance of 0.01 m. The average force that stops the object is??

4. ## Physics

A ball traveling with an initial momentum of 4.5 kgm/s bounces off a wall and comes back in the opposite direction with a momentum of –3.5 kgm/s. What is the change in momentum? Answer: -3.5-4.5= -8 kgm/s?

5. ## Physics

A force of F = 125 N is used to drag a crate 3.0 m across a floor. The force is directed at an angle upward from the crate so the vertical part of the force is Fv = 65 N and the horizontal part of the force is Fh = 107 N. How much work is done on the box?

6. ## Physics

A 2200 kg car can accelerate from 0 to 30.0 m/s in 5.5 seconds. What is the power required?

7. ## Physics

An impulse of 15 Ns acts on a 0.2 kg ball initially at rest. What is the final speed?

8. ## Physics

In an auditorium, a physics teacher uses a pendulum made by hanging a bowling ball from a wire to the ceiling. At the low point in its swing, a ball with a mass of 7.2-kg has a speed of 6 m/s. Ignoring air resistance, how high will the bob swing above the

9. ## Physics

A 10 kg rock that has been dropped from a 60 meter high cliff experiences a average force of air resistance of 30 N. Calculate the KE at the bottom of the fall.

10. ## Physics

A crowbar is used to pull a nail. The length of the effort arm of the crowbar is 26 cm and the resistance arm is 4.2 cm. What force in N is required to pull a nail if the friction force holding the nail in place is 120 N?

11. ## Physics

A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s. 50 kJ of work is done by friction on the way to the bottom of the ride. What is the speed at the bottom of the ride? I'm

12. ## Physics

A toy "spring gun" has a spring with a spring constant of 30,000 N/m and is depressed 4 cm. It shoots a plastic dart with a mass of 45 grams. How fast will the dart travel if there is no friction?

13. ## Physics

A rod has a pivot point on the left end, one force of 6 N up in the middle and one force of 3 N up on the right end. Can the system be at equilibrium? Explain. The book assigned for my course has 6 sentences on equilibrium. None of which discuss how one

14. ## Physics

Is it possible for a slower moving person to produce a higher horsepower than a faster moving person? If so under what circumstances? Why or why not?? I would think a slower moving person carrying a heavier weight could produce higher horsepower. this

15. ## Physics

A rock dropped from a bridge takes 3.21 seconds to hit the water. How high is the bridge in meters? I need to find Vsub0 to be able to calculate h....but how do I get Vsub0???

16. ## Physics

A basketball player throws a 1.2 kg ball 15 meters into the air. What is the increase in potential energy? What is the work done by the player? Is the answer the same for each, because I'm getting the same answer but I feel like something is wrong... 176J

17. ## Physics

A ball is dropped down to the floor and bounces back up to the same height. (we are assuming a "perfect" ball.) What is the change in the momentum? the change would be ZERO right? If the momentum was zero to begin with then there is zero change.

18. ## Physics

A bullet of mass 0.010 kg and speed of 100 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. The work done on the bullet by the block is so my answer is 50 but I'm getting it wrong? I don't understand why?? work=KE

19. ## Physics

A forensic scientist (CSI) is trying to find a weapon thrown off a bridge into the lake. Assume it is thrown horizontally and it sinks straight down once it hits the water. The bridge height is 15 meters and a normal throwing speed is 23 m/s. How far from

20. ## Physics

A weight of 15 N is located at a distance of 2.5 meters from the fulcrum of a simple lever. At what distance from the fulcrum should a weight of 20.0 N be placed on the opposite side of the fulcrum to balance the system?

21. ## Physics

A truck of mass 4000 kg is at rest, but free to roll with no resistance. If you push it forward with a force of 500 N, the momentum at the end of 5 s of pushing will be force=delta p/ delta t 500= delta p/5 p=2500?? right?

22. ## Physics

A racecar driver has to hold on tightly when going around a banked curve. Approximately what is the centripetal force on a 2,540.0 kg car going around a circle with a diameter of 190.0 meters at 25.0 m/s?

23. ## Physics

An airplane is flying at 95.0 m/s when the engine is turned off. As it glides, it experiences a force of drag so that is slows down at -0.700 m/s2. How far in meters will it travel in 1.00 minute ? answer: 4440m??

24. ## Physics

A runner travels 1.65 km in 5 min and 30 seconds. What is the velocity in m/s? Answer to two decimal places. I think I have answer since v=d/t convert 5 min 30 sec to seconds 330 seconds and 1.65km to 1650m 1650m/330sec answer: 5m/s Am I right?

25. ## Physics

The meter stick has a fulcrum at the 60.0 cm mark. There is 4.0 N at the 20.0 cm mark. The meter stick is uniform and has a weight of 2 N. How much force must be hanging from the 70.0 cm mark to balance the system? You may refer to Figure 7-34 in the

26. ## Physics

A racecar driver has to hold on tightly when going around a banked curve. How many "gs" does the driver experience in a 2200 kg car going around a circle with a radius of 95 meters at 25 m/s?

27. ## Physics

A man has a mass of 77.0 kg and is accelerating upward in an elevator at 2.50 m/s2 What is the normal force on his feet in newtons? 77.0kg x2.50m/s^2 + 77.0kg x 9.80m/s^2 = Answer: 947 N??

28. ## Physics

The center of gravity of a meter stick that weighs 1.950 N is at the 50.00 cm mark. A 3.54 N weight is suspended from the 20.0 cm mark and an 8.00 N weight is suspended from the 70.0 cm mark on the meter stick. Where would you place the fulcrum to balance

29. ## Physics

In a laboratory experiment, a calorimeter is used to find the specific heat of an unknown metal. 100.0 grams of dry metal shot are placed in a cup and heated to a temperature of 95 °C. The calorimeter is partially filled with 150 g of water at 20.0 °C.

30. ## Physics

A golf club head can be thought of as undergoing circular motion when you swing the club. If the club head has a mass of 0.65 kg, a speed of 24 m/s and a radius of 2.2 meters, (club length + arm length) what is the force on the club head due to the swing?

31. ## Physics

A croquet ball that is hit by a bat keeps rolling horizontally after it leaves the bat because of

32. ## Physics

How much force must be exerted at the right end to pick up the lever and load if it pivots at the left end? The 2.00 meter long lever weighs 1.50 N and is uniform. There is an 8.00 N weight resting on the 40.0 cm mark. so would it take .4m (40cm to m)

33. ## physics

What is the mass of a car that weighs 11,220 N? (The units are kg. Do not include units in the answer and you may round to 3 significant figures. ) so w=mg 11220=m9.80 11220/9.80=m 1144=m to three sig figures =1140 kg right?

34. ## Physics

A car accelerates from 0.0 to 33 m/s in 6.0 seconds. What is the magnitude of the acceleration? I got 198 but the answer is 5.5?? Not understanding this.

35. ## Physics

A car traveling at 22.0 m/s accelerates for 2.37 seconds at a rate of 2.25 m/s2. How far will it travel in meters during this time? (22.0)(2.37) +1/2(2.25)(2.37)= answer 58.5m right?

36. ## Physics

How much heat (in joules) is required to boil 250 grams of water that starts at 25C completely to steam? Use 4.2 J/gC for the specific heat

37. ## Physics

A force of 25 N is on the end of a 4 meter lever arm turning clockwise. What is the torque? so CW is neg so 25*-4=-100Nm right?

38. ## physics

A ball is thrown straight up from a bridge at a speed of 11.0 m/s. What will be its velocity (speed and direction) after 2.0 seconds?

39. ## Physics

A baseball is thrown horizontally from a height of 6 meters at a speed of 24 m/s. How far will it travel horizontally before it hits the ground?

40. ## physics

A water balloon with a mass of 1.20 kg is falling from a roof. If the average force of friction is 0.500 N, what is the acceleration on the balloon in m/s2? I am not sure how to get started

41. ## Physics

An elevator has a mass of 1200.0 kg. It is rising at a steady speed of 3.00 m/s. What is the tension in the cable lifting the elevator? so T=mg + ma m=1200.0kg g=9.8 m/s^2 a=?? I'm not sure how to get acceleration from what is given.

42. ## Physics

In the first step of nuclear fission, a U-235 atom absorbs a neutron and becomes U-236 before becoming unstable and breaking into two smaller atoms and emitting various energies and particles. The mass of the U-235 is 235 amu and the mass of the neutron is

43. ## Physics

A 600.0 kg roller coaster is going around vertical loop with a radius of 10.0 meters. The speed of the coaster is 14m/s at the top of the loop. What it the magnitude of the CENTRIPETAL force on the roller coaster, to the nearest whole number of newtons?

44. ## Physics

The acceleration due to the Earth's gravity, in English units, is 32 ft/s2. In the absence of air friction, a ball is dropped from rest. Its speed on striking the ground is exactly 60 miles/hr. For what time interval was the ball falling? I am unsure how

45. ## Physics

We often use a spoon to cool coffee by stirring. Some of the heat is conducted from the coffee to the air by this method, but the spoon itself will cool the coffee a little. If a 12 gram aluminum teaspoon at 22 o C is placed in 175 ml of water (coffee's

46. ## Physics

How much force must be exerted at the right end to pick up the lever and load if it pivots at the left end? The 2.00 meter long lever weighs 1.50 N and is uniform. There is an 8.00 N weight resting on the 40.0 cm mark. so would it take .4m (40cm to m)

47. ## Physics

A 2.0 kg lab car moving to the right with an initial velocity of 3.0 m/s collides with a 1.0 kg lab car moving to the left with a velocity of 8.0 m/s in a inelastic collision. What us the final velocity? Take left to be negative.

48. ## Physics

A projectile is launched horizontally from a height of 2.2 meters at 35 m/s. How far will it travel horizontally before it hits the ground?

49. ## Physics

A ball is thrown straight up from a bridge at a speed of 11.0 m/s. If it takes 5.5 seconds to hit the water below, what is the velocity just before it hits the water?

50. ## Physics

A 4 kg block, initially moving due east at 3 m/s, is acted upon by an impulse having magnitude 8 Ns and direction due west. The final velocity of the block is I keep getting this problem wrong. ok so momentum =massVelocity 3x4 =12kgm/s=impulse force delta

51. ## Physics

A 10 kg rock that has been dropped from a 60 meter high cliff experiences a average force of air resistance of 30 N. Calculate the KE at the bottom of the fall. so KE=PEgravity 5880 is the PE but no friction force deducted...do I just subtract 30N? my book

52. ## Physics

A roller coaster with a mass of 500.0 kg starts from a height of 27.0 meters with a speed of 5.1 m/s. It descends to a height of 2.00 meters before it starts back up. Some energy is loss to the work due to friction. The speed at the bottom of the ramp is

53. ## physics

An elevator has a mass of 1200.0 kg. It is rising at a steady acceleration DOWNWARD of -3.00 m/s2. What is the tension in the cable lifting the elevator? T=1200.0x9.8 +1200.0x-3600 =8160N right?

54. ## Physics

Three railroad cars are pulled by a train engine at a constant speed. How does the tension pulling the last single car compare to tension pulling all three of the cars. There is friction involved.

55. ## Physics

A runner can run a 400.0 meter lap in 50.0 seconds. He finishes at the same spot as he began. What is his average velocity?

56. ## Physics

A sprinter accelerates at 5.0 m/s2. How far will she travel in 4.0 seconds if she starts at 0 m/s?

57. ## Physics

How so I solve for Torque 2 mass? Torque 1= .125Nm Torque 2= mass? x 9.80 m/s^2 x .253m

58. ## Physics

When a baseball bat hits the ball, the impulse delivered to the ball is increased by is it "follow through"??

59. ## Physics

What is meant by KE being lost to the system in an inelastic collision?

60. ## Physics

Trying to understand what happens to KE in an inelastic collision. I know it is not conserved. Does that mean it is lost? But if energy is neither created or destroyed....how can KE be just lost? I am confused.

61. ## Physics

A 12000 kg train engine moving at 2.2 m/s locks into 3 boxcars with a total mass of 25000 kg sitting still. If the collision is inelastic and has little friction, how fast will the engine and cars move? I got 1.4 but correct answer is 0.71? I don't

62. ## Physics

What is the formula for NORMAL force?

63. ## Physics

A 1600 kg car moving at 22 m/s is in a wreck with a 2900 truck moving at 32 m/s in the opposite direction. Which exerts a greater magnitude of force on the other?

64. ## Physics

If you double the speed of a car, how much does the kinetic energy increase? How do you know?

65. ## Physics

If the speed of a car is doubled, the work to stop the car changes by a factor of so it's 4....but I cannot think of how I know it is double. Any explaination?

66. ## Physics Friction

A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s. 50 kJ of work is done by friction on the way to the bottom of the ride. What is the speed at the bottom of the ride?

67. ## Physics

A roller coaster with a mass of 500.0 kg starts from a height of 27.0 meters with a speed of 5.1 m/s. It descends to a height of 2.00 meters before it starts back up. Some energy is loss to the work due to friction. The speed at the bottom of the ramp is

68. ## Physics

In an auditorium, a physics teacher uses a pendulum made by hanging a bowling ball from a wire to the ceiling. At the low point in its swing, a ball with a mass of 7.2-kg has a speed of 6 m/s. Ignoring air resistance, how high will the bob swing above the

69. ## Physics

A 1600 kg car moving at 22 m/s is in a wreck with a 2900 truck moving at 32 m/s in the opposite direction. Which exerts a greater magnitude of force on the other?

70. ## Physics

An object has a mass of 24.0 kg and is accelerated horizontally at 4.0 m/s2. What is the force required?

71. ## Physics

Suppose you throw a ball vertically upward with a speed of 49 m/s. Neglecting air friction, what would be the speed of the ball 2.0 second later?

72. ## Physics

A car traveling at 22.0 m/s decelerates for 2.33 seconds at a rate of -2.25 m/s2. What will the final speed be in m/s? =16.8m/s??

73. ## Physics

A car moving at 22.0 m/s accelerates at 3.00 m/s2 for 2.39 seconds. What will the final speed be in m/s? do I use v subf= at+v sub0 3.00x2.39 +22.0= answer 29.17??

74. ## Physics

A ball is thrown straight up from a bridge at a speed of 11.0 m/s. What will be its velocity (speed and direction) after 2.0 seconds?

1. ## Physics

I just figured it out a few minutes ago. .1016x.126=.0128016/.253=.05059 or .0506kg

posted on July 2, 2019
2. ## Physics

this is what professor wrote I have no idea how to go about solving m1*g*L1=m2*g*L2 m1=.1016kg gravity 9.80m/s^s L1= .126m m2? L2 =.253m

posted on July 2, 2019
3. ## Physics

posted on June 30, 2019
4. ## Physics

if they are both going up and CCW then they are both positive so no cancel?

posted on June 30, 2019
5. ## Physics

I was reading the problem that the 40kg recoiled in 4.3 seconds. I'm tired :(

posted on June 27, 2019
6. ## Physics

or is it 4.3 m/s=-60v v=-.071??

posted on June 27, 2019
7. ## Physics

I am in an intro physics course, online as a pre-req no on site classes were available and my professor chose a crap book with little explaination and then just assigns us to read the book then answer question...so I must turn to the internet for help

posted on June 27, 2019
8. ## Physics

so I should set this up at initialV=combined and divided by the combined mass That's where I'm messing it up. thanks

posted on June 25, 2019
9. ## Physics

Is the impulse also -8 or is the impulse positive 8?

posted on June 24, 2019
10. ## Physics

75 m/s is the speed....so the momentum is the 15N?? or 15kgm/s??

posted on June 24, 2019
11. ## Physics

what is dP? this chapter in my book doesn't use the letter d? 15=0.2v v=75?

posted on June 24, 2019
12. ## Physics

ok! finally some clarity. thank you!

posted on June 24, 2019
13. ## Physics

Ok so my professor FINALLY responded to me and said the answer is -50 J not 50J with no explanation. What variable would I make negative to produce that answer? Would the velocity by negative since the wood is stopping the bullet?

posted on June 23, 2019
14. ## Physics

well how do I figure how much work the wood block did on the bullet??

posted on June 23, 2019
15. ## Physics

KE bottom KE top=PE top -friction 1/2(4500)v^2=4500(9.8)(22) -50000 v=20

posted on June 22, 2019
16. ## Physics

I've got a huge number this cannot be right. 1/2(4500)(2.0)^2 + 4500(9.8)(22)-50000=929200?????

posted on June 22, 2019
17. ## Physics

1/2(7.2)(6^2)=7.2(9.8)h h=1.8

posted on June 22, 2019
18. ## Physics

so 60 x 30 5880-1800=4080

posted on June 22, 2019
19. ## physics

KE=work work=fd force=w/d 50/0.01= answer: 5000N

posted on June 20, 2019
20. ## Physics

I have to get better about reading the question and figuring out what I need to know, then determining what I need to find in order to find the solution. I just look at it and panic and think I don't have all of the information to do it. thanks! a=

posted on June 20, 2019
21. ## Physics

solve graphically search youtube vector lab part 1 phys 1030

posted on June 19, 2019
22. ## Physics Friction

20

posted on June 19, 2019
23. ## Physics

KE top + PE top -energy lost to friction (L)=KE bottom + PE bottom 500*9.8*27 + 1/2(500)*5.1^2 =138802.5 500*9.8*2 + 1/2(500)*22^2 = 130800 138802.5-L=130800 138802.5=130800+ L 138802.5-130800=L 8002 J lost to friction

posted on June 19, 2019
24. ## Physics

how do I calculate friction?

posted on June 19, 2019
25. ## Physics

ok so KE=PE gravity which is mgh - h x friction force (10*9.80*60)-(60*30) =4080 J

posted on June 19, 2019
26. ## Physics

my book says PE gravity= mgh this is why I'm getting confused my book calls mgh PE and you say KE??

posted on June 19, 2019