Friday, April 23, 2010
Friday, April 9, 2010
physics12_practice_mtexam
Some practice for you...(an old midterm)
Physics 12: Midterm Exam
Please be sure to show all of your work.
1. Does the acceleration of a projectile ever go to zero? Explain.
2. For a projectile thrown at 60.0 km/h but at 50 degrees to the horizontal calculate:
a. the vertical velocity at 3 seconds
b. the horizontal velocity at 3 seconds
c. the instantaneous velocity at 3 seconds.
3. A tennis player serves a tennis ball from a height of 2.5 m. If the ball leaves the racket horizontally at 115 km/h, how far away will the ball land?
4. Will a football, kicked at 25 m/s at an angle of 35 degrees, clear a bar 3.0 m high and 23.0 m away? If so, by how much does it clear the bar? If not, by how much is the ball short?
5. Josie the pilot has a heading of [W 650 S] and a ground speed of 230 km/h. If the wind speed is 95 km/h south, determine Josie's speed relative to the air.
6. Cara kicks a ball at Ryan (he was teasing her) at 20 m/s from [W 30o N]. It rebounds at 5 m/s at [E 50o N]. Find the change in velocity of the ball (Be careful with the diagram here-remember to write your vector equation down first).
7. Allana tosses a 32.5g puck in the chuck a puck during intermission. If it starts gliding at 0.77 m/s and experiences a frictional force of 0.0070 N, how long does the puck take to stop and how far did it travel?
8. Shandra gets her dad's truck stuck in the snow. She convinces the boys from physics to push her out. Daniel and Benny push from the sides at an angle 27o. Ryan gets to push from the center. They each apply a force of 355N. Find the acceleration of Shandra and the truck (mass 1500kg) assuming no friction. If the acceleration was 0.37m/s2, find the force due to friction.
9. If the coefficient of friction of a ramp is 0.85, determine the minimum angle required so that a box will begin to slide.
10. Determine the acceleration and tension of a system where a 3 kg mass rests on a 35 degree incline (coefficient of friction 0.35) and a 5 kg mass hangs by a string off of the edge of the incline.
11. Cassandra designs a roller coaster with a vertical loop of radius 28m. What is the minimum speed the car must go through the loop so that his design doesn't hurt anyone.
12. Alyssa builds a giant clock with a pendulum 11.25 m long. If the bob is 3.875 kg determine the maximum tension when it swings with a speed of 3.5 m/s.
13. A squirrel attaches an acorn (mass 25g) to the end of a 0.80m long string and spins it in a vertical circle at a speed of 4.85m/s (angry little squirrel). Determine the maximum and minimum tensions in the string.
14. The average accelerating force exerted on a 3.50kg shell is 2.25x104 N. If the muzzle velocity is 265 m/s calculate:
a) the impulse on the shell
b) the length of time it takes the shell to exit the gun barrel.
15. A billiard ball moves at 6.8 m/s to the right. A second identical ball moves at 4.5 m/s to the left. If ball 2 moves with a velocity of 2.5 m/s to the right after they collide, what is the velocity of the first ball?
16. A 47 kg skateboarder runs at 5.2 m/s and jumps on his 1.75 kg skateboard (initially at rest). Find the combined speed of the skateboard and the rider.
17. A 325g bullet moving at 315 m/s hits and travels through a 1.25 kg block of wood, 0.35 m long. If the bullet's speed is 125 m/s after it leaves the block of wood find:
a) the block's velocity after the bullet exits;
b) the impulse applied to the block
c) the time the bullet spent in the wood;
d) the force applied to the bullet.
18. A soccer ball of mass 0.55 kg is kicked with a horizontal speed of 38 m/s. If a 29 kg goalie jumps up a catches the ball in mid-air (hooray for Gemma), what is the goalies's horizontal speed just after she catches the ball?
19. Radioactivity is the result of atoms that decay or break apart spontaneously. A stationary parent nucleus of mass 1.25x10-24 kg decays into three particles. One particle of mass 3.1x10-25 kg has a velocity of 2.1x107 m/s [E 45o N]. A second particle has a mass 2.9x10-25 kg with a velocity of 4.2x107 m/s [W 23o N]. Determine the mass and velocity of the third particle.
20. A 14000 kg space shuttle with a velocity of 3800 km/h [E 25o N], wishes to change it's course by 15 degrees. It does so by ejecting an object at a speed of 5.0x103 km/h [S]. Calculate the mass of the object (I couldn’t resist so here’s your HINT: Think SOH CAH TOA)
1 of 1
Practice Midterm Exam
With the midterm exam looming late next week here's an old one that might help you get started on you review.
Good Luck
Subscribe to:
Posts (Atom)
