1: The vertical and horizontal motions of a projectile are:
The same
Inversely proportional to one another
Directly proportional to one another
Independent of one another
2: The range of a projectile depends upon the acceleration due to gravity and upon both components of the initial:
Force
Position
Velocity
Acceleration
3: The angle that results in the maximum range of a projectile is:
180 deg.
30 deg.
45 deg.
60 deg
4: An arrow is shot at 30.0 degrees above the horizontal. Its initial velocity is 49 m/s and it hits the target. What is the maximum height the arrow will attain?
49 m
25 m
75 m
30 m
5: In question # 4, if the target is at the same height from which the arrow was shot, how far away is the target?
1.1 x 104m
2.1 x 104m
1.1 x 102m
2.1 x 102m
6: A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32m below the height from which it was thrown. How much time does it take for the dart to hit the board?
2.6 s
3.2 s
4.5 s
0.8 s
7: A basketball player tries to make a half court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0m from the basket, what speed must the player give the ball?
140 m/s
9.4 m/s
11.8 m/s
13.3 m/s
8: The range of a projectile launched at an angle is the same for which two angles?
15 degrees and 75 degrees
45 degrees and 30 degrees
45 degrees and 60 degrees
Answers b and c only
9: A ball is thrown at an angle of 66.0 degrees above the horizontal with an initial velocity of 4.47 m/s. What is the maximum height the ball attains?
1.532 m
1.698 m
0.849 m
2.55 m
10: In question # 9, what is the range of the ball thrown. (hint: use x = R; so x = vx0t)
1.51 m
3.02 m
1.36 m
1.70 m
11: In which of the following examples is a net force of zero acting on the object in question? I. A car drives around a circular racetrack at a constant speed. II. A person pushes on a door to hold it shut. III. A ball, rolling across a grassy field, comes to a stop.
I only
II only
III only
I and II
12: In figure 1 above a block is suspended from two ropes, so that it hangs motionless in the air. If the magnitude of T2 is 10.0 N, what is the magnitude of T1?
.500 N
0.866 N
10.0 N
17.3 N
13: A 50 kg crate rests on the floor. The coefficient of static friction is 0.5. The force parallel to the floor needed to move the crates is most nearly:
50 N
125 N
250 N
500 N
14: A person is pushing an object of mass m along the ground with a force F. The coefficient of kinetic friction between the object and the ground is (mu)k. The object is accelerating, but then the person stops pushing and the object slides to a halt. The person then starts pushing again with a force F, but the object doesn't budge. The maximum coefficient of static friction between the object and ground is ms. Which of the following statements is true?
F>(mu)k/(mu)s
(mu)kmgsmg
(mu)smg=F
The scenario described is physically impossible.
15: A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 5.0 kg mass, as in figure 2 above. At what angle will the system be in equilibrium? (in degrees)
-45
-30
30
45
16: A man of mass 80 kg sits in a chair. What it the magnitude of the normal force exerted on the man by the chair?
70.2 N
80 N
89.8 N
784 N
17: A force F acts on object A of mass m1. An identical force acts on object B of mass m2. A experiences acceleration a1 and B experiences acceleration a2. If a2 = 2a1, what is m2 in terms of m1?
1/2 m1
m1
2m1
4m1
18: Which is a vector quantity?
distance
speed
power
force
19: A granite block is being slid at a constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?
mass and speed of the block
mass and normal force on the block
frictional force and speed of the block
frictional force and normal force on the block
20: After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. Neglecting air resistancce, what is the approximate maximum height reached by the rocket?
49m
98m
120m
250m
21: What term describes how well the results of an experiment agree with the standard value?
Accuracy
Precision
Uncertainty
Reproducibility
22: Which of the following is the largest number?
1.23 E+4
1.23 x 10^4
12300
all of the above
23: The measurement 0.001234 g has how many significant digits?
4
2
3
1
24: According to graphing convention, the values of the dependent variable are plotted
vertically (on the x-axis).
vertically (on the y-axis).
horizontally (on the x-axis).
horizontally (on the y-axis).
25: Which of the following, is a place where you mightfind a physicist working?
high schools
hospitals
Wall Street
all of the above
2007-11-20 10:24:40 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Please help me with this, I am so far behind, I will fail the class if I dont get this done.?
1: The vertical and horizontal motions of a projectile are:
Independent of one another
2: The range of a projectile depends upon the acceleration due to gravity and upon both components of the initial:
Velocity
3: The angle that results in the maximum range of a projectile is:
45 deg.
4: An arrow is shot at 30.0 degrees above the horizontal. Its initial velocity is 49 m/s and it hits the target. What is the maximum height the arrow will attain?
30 m
5: In question # 4, if the target is at the same height from which the arrow was shot, how far away is the target?
212 m
6: A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32m below the height from which it was thrown. How much time does it take for the dart to hit the board?
0.26 sec
7: A basketball player tries to make a half court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0m from the basket, what speed must the player give the ball?
11.8 m/s
8: The range of a projectile launched at an angle is the same for which two angles?
15 degrees and 75 degrees
9: A ball is thrown at an angle of 66.0 degrees above the horizontal with an initial velocity of 4.47 m/s. What is the maximum height the ball attains?
0.849 m
10: In question # 9, what is the range of the ball thrown. (hint: use x = R; so x = vx0t)
1.70 m
11: In which of the following examples is a net force of zero acting on the object in question? I. A car drives around a circular racetrack at a constant speed. II. A person pushes on a door to hold it shut. III. A ball, rolling across a grassy field, comes to a stop.
I and II
12: In figure 1 above a block is suspended from two ropes, so that it hangs motionless in the air. If the magnitude of T2 is 10.0 N, what is the magnitude of T1?
.500 N
0.866 N
10.0 N
17.3 N
There is no figure 1
13: A 50 kg crate rests on the floor. The coefficient of static friction is 0.5. The force parallel to the floor needed to move the crates is most nearly:
250 N
14: A person is pushing an object of mass m along the ground with a force F. The coefficient of kinetic friction between the object and the ground is (mu)k. The object is accelerating, but then the person stops pushing and the object slides to a halt. The person then starts pushing again with a force F, but the object doesn't budge. The maximum coefficient of static friction between the object and ground is ms. Which of the following statements is true?
F>(mu)k/(mu)s
(mu)kmgsmg
(mu)smg=F
The scenario described is physically impossible.
The answers are unintelligble
15: A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 5.0 kg mass, as in figure 2 above. At what angle will the system be in equilibrium? (in degrees)
-45
-30
30
45
No Figure 2
16: A man of mass 80 kg sits in a chair. What it the magnitude of the normal force exerted on the man by the chair?
784 N
17: A force F acts on object A of mass m1. An identical force acts on object B of mass m2. A experiences acceleration a1 and B experiences acceleration a2. If a2 = 2a1, what is m2 in terms of m1?
1/2 m1
18: Which is a vector quantity?
force
19: A granite block is being slid at a constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete
frictional force and normal force on the block
20: After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. Neglecting air resistancce, what is the approximate maximum height reached by the rocket?
120m
21: What term describes how well the results of an experiment agree with the standard value?
Accuracy
Precision
Uncertainty
Reproducibility
Bunch of gobble d ****. They are asking what your book says.
22: Which of the following is the largest number?
all of the above
23: The measurement 0.001234 g has how many significant digits?
3 (actually 4, but with number beginning with "1" you usually round down)
24: According to graphing convention, the values of the dependent variable are plotted
vertically (on the x-axis).
vertically (on the y-axis).
horizontally (on the x-axis).
horizontally (on the y-axis).
Despite many years of education, I can never figure this out without really thinking. (I can never tell right from left, which I think is the reason).
25: Which of the following, is a place where you mightfind a physicist working?
all of the above
2007-11-20 11:31:35 · answer #1 · answered by Frst Grade Rocks! Ω 7 · 3⤊ 0⤋
Okay, are you studying and still failing? If not, you need to study - sorry, that is how it works. If you are studying and workign hard and still can't pass you should set up a meeting with your school psychologist. If you think you might have a learning disabilitiy he/she can help you figure it out and may even be able to test you for such before the end of the school year and assist you in getting help. Unfortunatly, that would probably put you in Special Education classes, which woudl likely help with school, but unfortunately carry a big stigma. SO, that sucks.
2016-05-24 09:06:25 · answer #2 · answered by ? 3 · 0⤊ 0⤋
1. independent of one another
2. velocity
3. 45 deg
4. 0 = 49sin(30) - 9.8 t
t = 2.5 sec
h = 49sin(30)t +(1/2)(-9.8)t^2
when t = 2.5 sec
h = 30.625 m
5. t = 2(2.5) = 5sec for it to go up and down
s = 49cos(30) t = 49(5) cos(30) = 212.2 m
6. h = -0.32 m
h = 1/2 (-9.8)t^2 = -0.32
t^2 = 0.065
t = 0.256 sec
7.
let t = time to reach the basket
14 = v cos(51) t = 0.629vt ------------[1]
1/2 t should be the time for the vertical component to reach 0 velocity.
0 = vsin(51) - 9.8(t/2)
0.777v - 4.9t = 0 --------------------------[2]
t = .777v/4.9 = 0.159v
substitute to [1]
14 = 0.629v(0.159v)
v^2 = 140
v=11.832 m/s
8) can not understand this!
9)
2007-11-20 11:11:40 · answer #3 · answered by Anonymous · 2⤊ 0⤋
Most of these are extremely simple, you're not talking difficult work here only reading and learning some basic things.
You will be even further behind if you don't read and learn at least enough to answer these for yourself. Anyone answering these for you will be doing you an extreme disservice, they will not be helping you..
Read these couple/three chapters and learn how to do it. You can't possibly need help on every one of these questions if you've read the material..
Not what you want to hear, but for sure the best answer.
2007-11-20 11:07:08 · answer #4 · answered by Alan K 2 · 6⤊ 1⤋