Ask Physics Expert

1) Greezy works in a factory because he does not make enough money from The Charming Beggars. He is pushing a very large crate of 50 kg across the floor at a constant velocity with a force of 200 N. He is pushing on the crate upwards at an angle of 20 °. See diagram.

365_What is the coefficient of kinetic friction.png

(a) What is the coefficient of kinetic friction between the ground and the crate?

(b) Greezy increases his force to 400 N. What is the acceleration of the crate?

2) Two masses, m1 = 10 kg and m2 = 5 kg, are connected by a string that passes over a pulley as shown below. Mass #1 is on a frictional surface. The system is released from rest. After 1.2 s, mass #2 drops 1.0 m. Calculate the coefficient of kinetic friction between the surface and mass 111.

2156_What is the coefficient of kinetic friction1.png

3) A large block of mass 25 kg is being accelerated along a frictionless surface by a horizontal force F. A smaller block of mass 4 kg is in contact with the front surface of the large block and will slide downward unless F is sufficiently large. The coefficient of static friction between the blocks is 0.71.

1058_What is the coefficient of kinetic friction2.png

Calculate the smallest magnitude that F can have in order to keep the block from sliding downward.

4) Skid of mass 45 kg is in orbit around the planet Hctina in the solar system Sraggeb. Skid is traveling at 4.05 x 104 m/s. Hctim has a mass of 1.9 x 1027 kg and a radius of 7.14 x 107 m.

Calculate Skid's altitude above the surface of the planet.

5) An air puck of mass 0.25 kg is traveling in a circle of radius 1 m. The puck is attached to a cable that passes through a hole in a frictionless table. The other end of the cable is attached to a hanging weight of 1 kg. The air puck is moving in a circular path on the table so that the hanging weight will remain motionless. See diagram below.

1909_What is the coefficient of kinetic friction3.png

(a) Find the tension in the cable,

(b) Name the force that is causing the air puck to move in a circle.

(c) What is the velocity of the puck?

6) At Magic Mountain there is a ride in which people stand up against the inside wall of a large cylinder of radius 3 in. The cylinder is then spun with a velocity of 15 m/s at which point the floor drops away leaving the riders suspended against the wall.

What is the minimum coefficient of static friction between the rider's clothing and the wall in order to keep the rider from sliding down?

7) A mass is hung from a ceiling by a cable that is 2 m in length. The mass is swung around so that it travels in a horizontal circle. While swinging the cable makes an angle of 30° with the vertical.

2283_What is the coefficient of kinetic friction4.png

Find the velocity of the mass in order to maintain the angle.

8) A horizontal spring with a mass of 8 kg is pulled out to a distance of 15 cm with an external force of 200 N. If the mass is released (i.e. no more external force) from this point, what will be its acceleration when it is 10 cm from equilibrium?

1) a) 0.445 b) 4.38 m/s2

2) 0.288

3) 400 N

4) 5.9 x 106m

5) a) 9.8 N c) 6.26 m/s

6) 0.131

7) 2.38 res

8) 16.7 m/s2

Physics, Academics

  • Category:- Physics
  • Reference No.:- M91372857
  • Price:- $50

Guranteed 36 Hours Delivery, In Price:- $50

Have any Question?


Related Questions in Physics

Question oppositely charged parallel plates are separated

Question: Oppositely charged parallel plates are separated by 5.31 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric field between the plates? N/C (b) What is the ma ...

Question an object of mass m attached to a spring of force

Question: An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is A and the total mechanical energy of the system is E. What is th ...

Quesion when a nucleus of 235u undergoes fission it breaks

Quesion: When a nucleus of 235U undergoes fission, it breaks into two smaller, more tightly bound fragments. Part A: Calculate the binding energy per nucleon for 235U. Express your answer with the appropriate units. E=__ ...

Question a nylon rope used by mountaineers elongates 130 m

Question: A nylon rope used by mountaineers elongates 1.30 m under the weight of a 65.0-kg climber. If the rope is 45.0 m in length and 7.0 mm in diameter, what is Young's modulus for this material? The response must be ...

Question an object is 30 cm in front of a converging lens

Question: An object is 30 cm in front of a converging lens with a focal length of 10 cm. Use ray tracing to determine the location of the image. What are the image characteristics: (i) upright or inverted, (ii) magnifica ...

Question an object of mass m is traveling on a horizontal

Question: An object of mass m is traveling on a horizontal surface. There is a coefficient of kinetic friction µ between the object and the surface. The object has speed v when it reaches x=0 and encounters a spring. Th ...

Question in one of the classic nuclear physics experiments

Question: In one of the classic nuclear physics experiments at the beginning of the 20th century, an alpha particle was accelerated towards a gold nucleus and its path was substantially deflected by the Coulomb interacti ...

Question an object of mass m is dropped from height h above

Question: An object of mass m is dropped from height h above a planet of mass M and radius R. Find an expression for the object's speed as it hits the ground. Express your answer in terms of the variables m,M,h,R and app ...

Question one type of bb gun uses a spring-driven plunger to

Question: One type of BB gun uses a spring-driven plunger to blow the BB from its barrel. (a) Calculate the force constant of its plunger's spring if you must compress it 0.130 m to drive the 0.0580-kg plunger to a top s ...

Question an object is placed 30 cm to the left of a

Question: An object is placed 30 cm to the left of a converging lens that has a focal length of 15cm. Describe what the resulting image look like (i.e. image distance, magnification, upright or inverted images, real or v ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As