PH 105 Final: PH105 S17 Final Exam

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turquoisegnu128

31 Jan 2019

School

University of Alabama

Department

Course

PH 105

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All

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Instructions: answer all questions, record your responses on a scantron sheet, on your scantron sheet, be sure to bubble in your full name and cwid, a projectile is red from ground level on a broad level plain. The initial speed is vo and the projectile is red at an angle with respect to the horizontal. S, between the block and the wall is 0. 90. Which minimum horizontal force do you have to apply in order to prevent the block from sliding down the wall? m. Name: a block of mass m = 100 g slides down a frictionless track, as shown in the gure. The block has an initial height of 5 m and is initially at rest. What is its nal angular speed: /3, 3 , o/ 3, 3 o, o, a harmonic wave travels in a wire with amplitude 6. 00 mm, wavelength 120 cm, and period of 1. 05 .

Related Questions

A toy cannon uses a spring to project a 5.80g projectile. The spring is originally compressed by 8.00cm and has a force constant of 15.54 N/m. When the spring is released, the projectile slides 15.0cm through the barrel of the cannon where the barrel exerts a constant fictional force on the projectile. The projectile leaves the barrel of the cannon with a speed of 3.50m/s. The barrel of the cannon makes a 60 degree angle with respect to the horizontal surface. Neglect any air resistance or any rotational effects. Assume that the projectile's starting elevation is at ground level. What is the force of kinetic friction between the projectile and the barrel of the cannon? What is the maximum height of the projectile above ground level during its flight? How long does it take the projectile to reach its height?

In the latest Indian Jones film, Indy is supposed to throw agrenade from his car, which is going 95.0 , to his enemy's car,which is going 125 . The enemy's car is 13.0 in front of the Indy'swhen he lets go of the grenade.

If Indy throws the grenade so its initial velocity relative to himis at an angle of 45 above the horizontal, what should themagnitude of the initial velocity be? The cars are both travelingin the same direction on a level road. You can ignore airresistance.

Hint: The grenade moves in projectile motion, and convert the twovelocities given in the problem from km/hr to m/s. Being anexcellent student of P2, Indy knows that horizontal range of thegrenade must equal the distance that the enemies car is ahead atthe time the grenade is thrown plus the distance the enemies cartravels while the grenade is in the air. This distance is given byv_rel*t, where v_rel the relative velocity of the enemies carrelative to the Indy's and t is the time in the air.

Solve for time that the grenade is in the air in terms ofv_0.

Use the range equation to get the grenade distance as a function ofv_0

Set R=(initial separation)+v_rel*t and get a 2nd order polynomialfor v_0. Use quadratic equation to get v_0. This is the magnitudeof the velocity vector relative to Indy.

and...
Find the magnitude of the velocity relative to the earth.

Hint: Use Galileo's equation where Frame A is ground, Frame B isIndy's car and the object of interest P is the granade.

Use your answer in part A for speed and given direction tocalculate the x and y components of the velocity with respect toIndy's car. The velocity of Indy's car with respect to the groundis straightforward to write in x and y components.

In the latest Indian Jones film, Indy is supposed to throw agrenade from his car, which is going 82.0 km/h, to his enemy's car,which is going 125km/h. The enemy's car is 14.6m in front of theIndy's when he lets go of the grenade.

=====>Part A: What is the Vo ? in km/h

If Indy throws the grenade so its initial velocity relative to himis at an angle of 45 ^\circ above the horizontal, what should themagnitude of the initial velocity be? The cars are both travelingin the same direction on a level road. You can ignore airresistance.

Hint: The grenade moves in projectile motion, and convert the twovelocities given in the problem from km/hr to m/s. Being anexcellent student of P2, Indy knows that horizontal range of thegrenade must equal the distance that the enemies car is ahead atthe time the grenade is thrown plus the distance the enemies cartravels while the grenade is in the air. This distance is given byv_rel*t, where v_rel the relative velocity of the enemies carrelative to the Indy's and t is the time in the air.

Solve for time that the grenade is in the air in terms ofv_0.

Use the range equation to get the grenade distance as a function ofv_0

Set R=(initial separation)+v_rel*t and get a 2nd order polynomialfor v_0. Use quadratic equation to get v_0. This is the magnitudeof the velocity vector relative to Indy.

=====>Part B: What is Vo in km/h?

Find the magnitude of the velocity relative to the earth.

Hint: Use Galileo's equation where Frame A is ground, Frame B isIndy's car and the object of interest P is the granade.

Use your answer in part A for speed and given direction tocalculate the x and y components of the velocity with respect toIndy's car. The velocity of Indy's car with respect to the groundis straightforward to write in x and y components.

PH 105 Final: PH105 S17 Final Exam

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