Most popular questions and responses by MUHAMMAD JUNAID
1. Physics

A train car with mass m1 = 591 kg is moving to the right with a speed of v1 = 7.3 m/s and collides with a second train car. The two cars latch together during the collision and then move off to the right at vf = 4.7 m/s. a. What is the initial momentum of

2. Physics

A 0.2 kg yo-yo consists of two solid disks of radius 5.5 cm joined together by a massless rod of radius 1 cm and a string wrapped around the rod. One end of the string is held fixed and is under constant tension T as the yo-yo is released. a. Find the

3. Physics

An object with total mass mtotal = 15.8 kg is sitting at rest when it explodes into three pieces. One piece with mass m1 = 4.5 kg moves up and to the left at an angle of θ1 = 18° above the –x axis with a speed of v1 = 27.6 m/s. A second piece with mass

4. Physics

One study suggests that a brain concussion can occur if a person's head is subjected to an acceleration as small as 60g, where g is the acceleration of gravity. a. If the mass of the person's head is 4.5 kg, what is the magnitude of the force? (Express

5. Physics

A racquet ball with mass m = 0.238 kg is moving toward the wall at v = 12.5 m/s and at an angle of θ = 31° with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and rebounds at the same angle with

6. Physics

A 4 kg block resting on a frictionless horizontal ledge is attached to a string that passes over a pulley and is attached to a hanging 2 kg block. The pulley is a uniform disk of radius 9 cm and mass 0.2 kg. a. Find the speed of the 2 kg block after it

7. Physics

A balance scale has unequal arms. The scale is balanced with a m = 1.2-kg block on the left pan and a M = 1.91 kg block on the right pan (see figure). If the 1.91-kg block is removed from the right pan and the 1.2-kg block is then moved to the right pan,

8. Physics

A 1 m diameter wagon wheel consists of a thin rim having a mass of 6 kg and six spokes each having a mass of 1.5 kg. Determine the moment of inertia of the wagon wheel for rotation about its axis.

9. Physics

A bumper car with mass m1 = 109 kg is moving to the right with a velocity of v1 = 4.9 m/s. A second bumper car with mass m2 = 83 kg is moving to the left with a velocity of v2 = -3.5 m/s. The two cars have an elastic collision. Assume the surface is

10. Physics

A blue car with mass mc = 528 kg is moving east with a speed of vc = 17 m/s and collides with a purple truck with mass mt = 1352 kg that is moving south with an unknown speed. The two collide and lock together after the collision moving at an angle of θ =

11. Physics -- Homework Dump

A disk with mass m = 5.8 kg and radius R = 0.47 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.46 m from the rope and at a frequency f = 18.7 rev/s (with a direction shown by the arrow). a. What is the magnitude

12. Physics

A white billiard ball with mass mw = 1.43 kg is moving directly to the right with a speed of v = 3.4 m/s and collides elastically with a black billiard ball with the same mass mb = 1.43 kg that is initially at rest. The two collide elastically and the

13. Physics

In a stunt, three people jump off a platform and fall 9.9 m onto a large air bag. A fourth person at the other end of the air bag, the "flier," is launched 19 m vertically into the air. Assume all four people have a mass of 67 kg. a. What fraction of the

14. Physics

One study suggests that a brain concussion can occur if a person's head is subjected to an acceleration as small as 60g, where g is the acceleration of gravity. a. If the mass of the person's head is 4.5 kg, what is the magnitude of the force? (Express

15. Physics

Julie has been hired to help paint the trim of a building, but she is not convinced of the safety of the apparatus. A 4.9 m plank is suspended horizontally from the top of the building by ropes attached at each end. She knows from previous experience that

16. Physics

Ms. Sue, If you see this answer it. "This website is not meant for cheating" Nobody would't need it if it wasn't. If you're not here to give answers leave.

17. Physics

A spherical bowling ball with mass m = 3.7 kg and radius R = 0.103 m is thrown down the lane with an initial speed of v = 8.9 m/s. The coefficient of kinetic friction between the sliding ball and the ground is μ = 0.31. Once the ball begins to roll

18. Physics

The particles as shown in the figure below are connected by a very light rod. They rotate about the y axis at 1.9 rad/s. a. Find the speed of each particle, and use it to calculate the kinetic energy of this system directly from 1/2 mivi2. speed of m1 = 1

19. Physics

A ceiling fan consists of a small cylindrical disk with 5 thin rods coming from the center. The disk has mass md = 2.9 kg and radius R = 0.22 m. The rods each have mass mr = 1.4 kg and length L = 0.83 m. a. What is the moment of inertia of each rod about

20. Physics

A disk with mass m = 9.8 kg and radius R = 0.31 m begins at rest and accelerates uniformly for t = 18.7 s, to a final angular speed of ω = 31 rad/s. a. What is the angular acceleration of the disk? b. What is the angular displacement over the 18.7 s? c.

21. Physics

A man with mass m1 = 59 kg stands at the left end of a uniform boat with mass m2 = 163 kg and a length L = 3.5 m. Let the origin of our coordinate system be the man’s original location as shown in the drawing. Assume there is no friction or drag between

22. Physics

An object is formed by attaching a uniform, thin rod with a mass of mr = 6.95 kg and length L = 4.96 m to a uniform sphere with mass ms = 34.75 kg and radius R = 1.24 m. Note ms = 5mr and L = 4R. a. What is the moment of inertia of the object about an axis

23. Physics

A gymnast with mass m1 = 44 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 109 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end of the

24. Physics

A person with mass m1 = 57 kg stands at the left end of a uniform beam with mass m2 = 92 kg and a length L = 2.7 m. Another person with mass m3 = 67 kg stands on the far right end of the beam and holds a medicine ball with mass m4 = 12 kg (assume that the

25. Physics

1- Suppose a bicycle wheel is rotated about an axis through its rim and parallel to its axle. Is its moment of inertia about this axis greater than, less than, or equal to its moment of inertia about its axle? a. less than b. greater than c. equal to 2-

26. Physics

A person with mass mp = 74 kg stands on a spinning platform disk with a radius of R = 2.31 m and mass md = 183 kg. The disk is initially spinning at ω = 1.8 rad/s. The person then walks 2/3 of the way toward the center of the disk (ending 0.77 m from the

27. Physics

A 10 m beam of mass 295 kg extends over a ledge. The beam is not attached, but simply rests on the surface. A 63 kg student intends to position the beam so that he can walk to the end of it. How far from the edge of the ledge can the beam extend?

28. Physics

On a weekend archeological dig, you discover an old club-ax that consists of a symmetrical 8.3 kg stone attached to the end of a uniform 1.8 kg stick. You measure the dimensions of the club-ax as shown in the figure: the stick is 98 cm long, and the 18 cm

29. Physics

The particles as shown in the figure below are connected by a very light rod. They rotate about the y axis at 1.9 rad/s. a. Find the speed of each particle, and use it to calculate the kinetic energy of this system directly from 1/2 mivi^2. speed of m1 = 1

30. Physics

A solid disk of mass m1 = 9.4 kg and radius R = 0.25 m is rotating with a constant angular velocity of ω = 36 rad/s. A thin rectangular rod with mass m2 = 3.1 kg and length L = 2R = 0.5 m begins at rest above the disk and is dropped on the disk where it

31. Physics

A ladder of length L = 2.1 m and mass m = 18 kg rests on a floor with coefficient of static friction μs = 0.57. Assume the wall is frictionless. a. What is the normal force the floor exerts on the ladder? b. What is the minimum angle the ladder must make

32. Physics

A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +49 N·m is applied to the wheel for 16 s, giving the wheel an angular velocity of +685 rev/min. The external torque is then removed, and the

33. Physics

A cyclist accelerates from rest. After 7 s, the wheels have made 2 revolutions. a. What is the angular acceleration of the wheels? b. What is the angular velocity of the wheels after 7 s?

34. Physics

A thin uniform rod 98 cm long is balanced 32.6666666666667 cm from one end when an object whose mass is (2m + 2.0 grams) is at the end nearest the pivot and an object of mass m is at the opposite end (Figure a). Balance is again achieved if the object

35. Physics

A uniform disk with mass m = 8.95 kg and radius R = 1.32 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 346 N at the edge of the disk on the +x-axis, 2) a force 346 N at the edge of the disk