Видео 172
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13:18

Mechanical Energy (ME)_3.1

12:35

Mechanical Energy (ME)_3

9:16

Mechanical Energy (ME)_13

10:07

Mechanical Energy (ME)_11

14:47

Mechanical Energy (ME)_3

14:08

Mechanical Energy (ME)_16

A cannonball of mass 4 kg is fired horizontally from a height of H = 20 m above ground level. Neglect any effect due to air resistance.
What is the initial mechanical energy MEi of the cannonball?
What is the kinetic energy KE at point A?
What is the cannonball’s velocity at point A?
What is the cannonball’s speed at point B?
What is the net work ΣW on the cannonball during the entire motion?
Calculate the total time of flight.

Видео

13:18

Mechanical Energy (ME)_8

Просмотров 404 часа назад

A 350 kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the figure below. Using conservation of energy, calculate the roller coaster’s speed at point B? the roller coaster’s kinetic energy KE at point C? the roller coaster’s speed at point D? How hard does it press against the track at point D? What is the magnitude of the centripetal force Fc...

12:35

Mechanical Energy (ME)_3.1

Просмотров 524 часа назад

Four balls with different masses are dropped simultaneously from the heights shown. Air resistance may be ignored. Which of the following statements is CORRECT? SELECT ALL THAT APPLY. Ball A will hit the floor first. PEA PEB PEC PED aA aB aC aD Ball D has the greatest average speed savg. 𝑣_(𝑓,𝐴)=1/2 𝑣_𝑓 ,_𝐷

9:16

Mechanical Energy (ME)_3

Просмотров 484 часа назад

The diagram below shows the path of a skier who descends a slope AB. The skier starts from rest at A and eventually comes to rest again at C on the horizontal surface BC. The slope AB has a vertical height of 35 m. The total mass of the skier is 65 kg. The kinetic energy of the skier at point B is 11,000 J. Is this a conservative or non-conservative system? Justify! What is the skier’s speed at...

10:07

Mechanical Energy (ME)_13

Просмотров 487 часов назад

A 75 kg person slides a distance of 5 m on a straight water slide, dropping through a vertical height of 2.5 m. If the person’s speed at the bottom of the water slide is v = 6.2 m/s, (B) what is the net work ΣW done on the person? (C) calculate the energy lost. (D) find the magnitude of the average acceleration |𝑎_𝑎𝑣𝑔 |.

14:47

Mechanical Energy (ME)_11

Просмотров 1029 часов назад

A pendulum (m = 3 kg) is constructed by attaching a small metal ball to one end of a string of length L = 1.6 m that hangs from the ceiling, as shown in the figure below. The ball is released when it is raised high enough for the string to make an angle of θ = 50∘ with the vertical. Assume no energy lost. Calculate the initial gravitational potential energy PEi the of ball at point A. What is t...

14:08

Mechanical Energy (ME)_3

Просмотров 5314 часов назад

A steel ball with a mass of 0.75 kg is initially at rest. It is then dropped from a height of 30 m above the ground. (A) What is the ball’s initial mechanical energy MEi? (B) What is the ball's kinetic energy KE just before it hits the ground? (C) What is the ball’s kinetic energy KE after it has fallen a distance of 5 m? (D) What is the ball’s potential energy PE at t = 1.25 s? (E) What is the...

13:40

Mechanical Energy (ME)_4

Просмотров 5314 часов назад

A 4 kg is released from rest at the top of a frictionless incline that has a height of 10 m, as shown below. Calculate the block’s speed at the bottom of the incline. Calculate the time it takes to reach the bottom. What is the magnitude of the block’s acceleration?

10:09

Forces_5

Просмотров 2314 часов назад

As shown in the figure below, a block of mass 3 kg is pushed up against the vertical wall by a force of 60 N acting at 45o to the horizontal (ceiling). The coefficient of kinetic friction between the block and the wall is 0.61. Find the magnitude of the frictional force |𝐹_𝑘 |. Find the force F needed to keep the block moving up with a constant velocity.

5:38

Parallel Springs_2

Просмотров 4321 час назад

Two springs A and B are connected in parallel as shown below. They are subjected to a weight of 5 N. Spring A has a spring constant of kA = 25 N/m and spring B has a spring constant of kB = 50 N/m. What is the extension of each spring? What is the force experienced by spring A? What is the force experienced by spring B?

Series and Parallel Combination of Springs_3

9:24

Series and Parallel Combination of Springs_3

Просмотров 3121 час назад

A number of similar springs, each having the same spring constant, are joined in four arrangements, as shown below. Same load is applied to each arrangement. Which arrangement gives the GREATEST extension?

8:36

Inclined Ramp_6

Просмотров 5921 час назад

A force is applied horizontally to a block to move it up a 30o incline, as shown below. The incline is frictionless. If F = 50 N and M = 6.5 kg, what is the magnitude of the acceleration |𝑎| of the block? What is the magnitude of the contact force |𝐹_𝑁 | exerted by the incline surface onto the block?

16:19

Mechanical Energy (ME)_6

Просмотров 68День назад

A 3100 kg roller coaster is released from rest at Point A of the track shown in the figure below. Assuming that friction is negligible, what is the speed of the roller coaster at Point B? Assuming that friction is negligible, what is the speed of the roller coaster at Point C? Assuming that friction is negligible, what is the speed of the roller coaster at Point D? Assume that the segment from ...

6:45

Centripetal Force and Acceleration_21

Просмотров 71День назад

An object m is tied to one end of a string, moves in a circle with a constant speed v on a horizontal frictionless table. The second end of the string is connected to a big mass M and goes through a small hole in the table. What is the value of M if it stays in equilibrium?

12:40

Centripetal Force and Acceleration_13

Просмотров 89День назад

A bucket of mass 3.2 kg is whirled at a constant rate in a vertical circle of radius 1.7 m long cord (negligible mass), as shown below. The bucket makes 6 revolutions per second (rev/s). (A) Calculate the linear speed of the bucket. (B) Calculate the centripetal force Fc of the bucket. (C) Calculate the tension in the cord at the bottom (point C) and top (point A) of the arc. (D) Calculate the ...