PLEASE VIEW THE LINKS ABOVE THESE NOTES. THERE ARE GREAT ANIMATIONS WHICH WILL HELP YOU UNDERSTAND BIOLOGY AND THE CONCEPTS IN BIOLOGY.
HOW TO STUDY FOR SUCCESS:
1. SPEND TEN(10) MINUTES EVERYDAY REVIEWING WHAT YOU LEARNED IN BIOLOGY THAT DAY.
2. REWRITE WHAT YOU READ ON A SEPARATE PIECE OF PAPER WITHOUT LOOKING BACK AT YOUR NOTES. IF YOU MISSED SOMETHING READ IT AGAIN AND REWRITE UNTIL YOU KNOW EVERYTHING YOU WROTE IN YOUR NOTES.
3. MAKE INDEX CARDS OF 3 - 5 NEW WORDS OR TERMS ON ONE SIDE, AND THEIR DEFINITIONS ON THE OTHER SIDE.
4. START STUDYING FOR A TEST WHEN YOU ARE TOLD YOU ARE GOING TO HAVE A TEST AND NOT THE NIGHT BEFORE A TEST.
5. ASK FOR HELP WHEN YOU DON'T UNDERSTAND.
6. USE THE LINKS ABOVE IF YOU WANT MORE UNDERSTANDING OF BIOLOGY.
IF YOU DO ALL THE ABOVE YOU WILL PASS THE CLASS AND THE REGENTS EXAM IN JUNE.
NO EXCUSES AND NO EXCEPTIONS!!!!!!!!!!!
Physics Final Review
1. Convert:
a. 478 mg into kilograms
b. 35 mph to km/h
2. Solve:
a. 5 X 10-7 kg + 4 X 10-7 kg
b. 4 X 10-5 m ¨C 9 X 10-3 m
c. (7 X 105 g)(5 X 10-6g)
d. (2 X 10-2 kg)/(4.3 X 10-4 g)
3. A car is driven 165 km due west, then 70 km due south. What is the magnitude of its displacement?
4. A plane flies 125 km south, turns left travels 250 km, turns 20o to the right and flies 75 km to the airport. What is its displacement?
5. After walking 3.2 km you turn 40o to the right and walk another 5.6 km. What is your total displacement?
6. A quarterback throws a football 30 m in the direction 45o toward the opponent¡¯s goal line. What are the horizontal and vertical components of the balls displacement?
7. Convert 12 m/s into mph.
8. A car with a velocity of 27 m/s is accelerated uniformly at the rate of 2.3 m/s2 for 8.2 s. What is its final velocity?
9. A supersonic jet flying at 145 m/s is accelerated uniformly at the rate of 36.3 m/s2 for 45 s.
a. What is its final velocity?
b. The speed of sound in air is 331 m/s. How many times the speed of sound is the plane¡¯s final speed?
10. A 569 kg car starts from rest and accelerates uniformly to 8 m/s, traveling a distance of 30 m before striking a beach ball off the edge of a 17 m drop. Calculate the force of the car the ball is projected with.
11. Your brother's mass is 35.6 kg, and he has a 1.5 kg skateboard. What is the combined momentum of your brother and his skateboard if they are going 9.50 m/s?
12. A constant force of 6.00 N acts on 3 kg object for 10 s. What are the changes in the object's momentum and velocity?
13. Small rockets are used to make tiny adjustments in the speed of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 72000 kg spacecraft by 63 cm/s, how long should it be fired?
14. A space probe with a mass of 7.600 x 103 kg is traveling through space at 125 m/s. Mission control decides that a course correction of 30o is needed and instructs the probe to fire rockets perpendicular to its present direction of motion. If the gas expelled by the rockets has a speed of 3.200 km/h, what mass of gas should be released? Hint: draw a sketch showing the triangle and use tan 30o = mgvg/mpvp1.
15. Lee pushes a 20 kg mass 10 m across a floor with a horizontal force of 80 N. Calculate the amount of work Lee does.
16. Stan does 176 J of work lifting him-self 0.300 m. What is Stan¡¯s mass?
18. Mike pulls a 4.5 sled across level snow with a force of 225 N along a rope that is 35.0o above the horizontal. If the sled moves a distance of 65.3 m, how much work does Mike do?
19. Sau-Lan has a mass of 52 kg. She rides the up escalator at Ocean Park in Hong Kong. This is the world¡¯s longest escalator, with a length of 227 m and an average inclination of 31o. How much work does the escalator do on Sau-Lan?
20. A force of 300.0 N is used to push a 145 kg mass 30.0 m horizontally in 3.00 s.
a. Calculate the work done on the mass?
b. Calculate the power developed?
21. An 845 N sled is pulled a distance of 185 m. The task requires 1.20 X 104 J of work and is done by pulling on a rope with a force of 125 N. At what angle is the rope held?
22. An asteroid revolves around the sun with a mean (average) orbital radius 3 times that of Earth¡¯s.
a. Predict the period of the asteroid in Earth years.
b. Calculate the speed of the asteroid.
23. The moon has a period of 27.3 days and has a mean distance of 3.90 x 105 km from the center of Earth.
a. Find the period of a satellite that is in orbit 7.60 x 103 km from the center of Earth.
b. Calculate the speed of the satellite.
24. The sun is considered to be a satellite of our galaxy, the Milky Way. The sun revolves around the center of the galaxy with a radius of 2.2 X 1020 m. The period of one revolution is 2.5 x 108 years.
a. Find the mass of the galaxy.
b. Assuming that the average star in the galaxy has the same mass as the sun, find the number of stars in the galaxy.
c. Find the speed with which the sun moves around the center of the galaxy.
d. Find and compare the speed with which Mercury and Saturn move around the sun.
e. Find the periods of both Mercury and Saturn.
25. A stone is thrown horizontally at a speed of 4.3 m/s from the top of a 15 m cliff.
a. How long does it take the stone to reach the bottom of the cliff?
b. How far from the base of the cliff does the ball travel?
c. What are the horizontal and vertical components of the stone before it reaches the ground?
26. A 595 kg racing car completes one lap in 10.8 s around a circular track with a radius of 46.0 m. The car moves at a constant speed.
a. What is the acceleration of the car?
b. What force must the track exert on the tires to produce this acceleration?
27. An athlete whirls in a 6.25 kg hammer tied to the end of a 1.6 m chain in a horizontal circle. The hammer makes one revolution in 1.2 s.
c. What is the centripetal acceleration of the hammer?
d. What is the tension in the chain?
28. You accidentally throw your car keys horizontally at 7.3 m/s from a 57 m high cliff. How far from the base should you look for the keys?
29. Mass = 521 kg
Velocity = 2.69 x 104 km/h
a. Find momentum.
b. If new mass is 2361 kg, what is the velocity using the answer in part a.
30. t = 3.2s
F = 4.3 X 103 N
a. Find impulse
b. If velocity is 4.36 X 102 km/h, calculate P1 using mass in 29b.
c. Calculate P2 using 30a and 30b
d. Calculate the new velocity
31. Mass = 973 kg
v1 = 7.3 X 102 km/h
v2 = 5.29 X 104 km/h
t = 0.075 hrs
Calculate:
a. Change in momentum
b. Force
32. A 135 N sign is hung by two ropes each with an angle of 32o with the horizontal. What force does each rope exert?
33. A 7.3 N weight has one horizontal rope exerting a force of 4.7 N on it.
a. What are the magnitude and direction of the resultant force on the weight?
b. What force is needed to put the weight in equilibrium?
34. Two ropes pull on ring. One rope exerts a 43 N force at 42o and the other force a 71 N force at 76o.
a. What is the net force on the ring?
b. What is the equilibrant?
35. If A acts on an object with 47 N force at 243o, and force B acts on the same object with a 56 N force at 327o. What is the equilibrant?
36. What is the acceleration of a 56 kg trunk on a 24o incline?
37. What are the x an y components of a 59 kg skier going down a 42o incline on a hill?
38. What is the acceleration of the skier in question 6, if the coefficient of friction is 0.19?
39. What is the new coefficient of friction if the net force becomes zero?
40. Two balls have their centers 2.0 m apart. One ball has a mass of 8.0 kg. The other has a mass of 6.0 kg. What is the gravitational force between them?
Bonus Questions II
Formulas
W = qDV | F = KqAqB/d2 | DV = Ed | E = F/q
1.What work is done when 8.3 C is moved through an electric potential difference of 1.5 V?
2. Two objects with opposite charges are placed 267cm apart. Object A has a charge of 24.9 mC and object B has a charge of 37.2mC. Calculate the force A exerts on B.
3. What force does a test charge with 9.3 X 10-4 C experience in an electric field of the magnitude 4.6 X 10-3 N/C?
4. What electric potential difference is applied to two metal plates that are 73.2cm apart if the electric field between them is 7.21 X 106 N/C?
Formulas
F = Gm1m2/d2
v = ¡ÌGmE/r
T = 2¡Çr/v
T = 2¡Ç ¡Ìr3/GmE
(TC/TI)2 = (rC/rI)3
W = Fd
P = W/t
W = Fd cos theta
W = Fd sin theta
F = mg
P = mv
Impulse = F∆t = ∆p
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