PHYS 221 Midterm: PHYS 221 Iowa State Exam2 S10 Solutions

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turquoisegnu128

15 Feb 2019

School

Iowa State University

Department

Physics

Course

PHYS 221

Professor

All

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Document Summary

28) a roller coaster starts with a speed of 8. 0 m/s at a point 45 m above the bottom of a dip (see figure). Since gravity is a conservative force mechanical energy is conserved: = f i e: 8 m/s, 12 m/s, 17 m/s, 19 m/s, 21 m/s mgh i hg i mgh mv mv v. 19= sm v f: a block with mass m = 2. 0 kg is released from rest at the top of an incline. The incline makes an angle of 20 with the horizontal. The coefficient of kinetic friction between the block and the incline is 0. 20. What will be the speed of the block after sliding 4. 0 m along the incline: 2. 2 m/s, 3. 0 m/s, 3. 5 m/s, 5. 2 m/s, 6. 0 m/s. 2 + gmf k mg sin cos ad ad. )(cid:68) sin sin f v f v f. 2 gd cos sin k.

Related Questions

A roller coaster starts at a point 30 m above the bottom of adipwith a speed of 25 m/s. Neglect friction, what will be the speedofthe roller coaster at the top of the next slope, which is 45mabove the bottom of the dip?
A) 16 m/s
B) 18 m/s
C) 14 m/s
D) 20 m/s

Ima Scaarred (m=56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m high roller coaster loop.

a. Determine Ima’s kinetic energy at the top of the loop.

b. Determine Ima’s potential energy at the top of the loop.

c. Assuming negligible losses of energy due to friction and air resistance, determine Ima’s total mechanical energy at the bottom of the loop (h=0 m).

d. Determine Ima’s speed at the bottom of the loop.

turquoisebear631

1. An object of mass 19 kg is placed on incline with friction.The incline is originally horizontal and then raised slowly and at21 degrees, the mass begins to slide down the incline. It is foundthat the coefficient of kinetic friction is 0.79 times thecoefficient of static friction. If the same object (same mass) isplaced on the same incline with an inclination angle of 42.2degrees (the mass will slide down the incline at this angle), whatis the magnitude of the acceleration on the mass in m/s2?
2. A mass enters the bottom of a 50 degree incline with acoefficient of kinetic friction of 0.6. At the bottom of theincline the mass is moving at 33 m/s and is moving up the incline.After the mass has traveled, 25 meters up the incline, what is themagnitude of its velocity in m/s?
3. A car is traveling around a circular, banked track withoutfriction. It is initially traveling around the bottom of the ramp(on the ground) where the inner radius of track is 351 meters. Thecar then increases its velocity by a factor of 1.7. If theinclination angle is 10 degrees, what is the height (verticaldistance above the ground) the car is traveling at this newvelocity. Answer in meters.
4. An yo-yo with a mass of 2.4 kg is swung in a vertical circle. Itis found that the string breaks at 228 Newtons. If its the yo-yo'sspeed is a constant and is the maximum speed the yo-yo can movebefore the string breaks, what is the the tension in the string atthe top of the circle in Newtons?
5. A roller coaster cart of mass 15.8 kg travels on the inside of aroller coaster track in a loop of radius 23.1 meters. The circle isa vertical circle similar to the yo-yo example done in class. Ifthe cart travels at a constant speed around the track and the valueof this speed is the minimum speed such that cart does not fall offthe track at the top of the track, was is the magnitude of thenormal force on the cart at the bottom of the track in Newtons?

PHYS 221 Midterm: PHYS 221 Iowa State Exam2 S10 Solutions

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