Physics Rotational Mechanics Level: High School
Uniform circular motion
An object is moving in a circular path with an angular speed of 1.52 rad/s . How long does it take the object to complete one revolution ?
a) 4.13 s
b) 2.07 s
c) 118 s
d) 4.77 s
Physics Rotational Mechanics Level: High School
Centre of mass
A 60.0 kg man stands at one end of a 20.0 kg uniform 10.0 m long board . How far from the man is the center of mass of the man-board system ?
a) 1.25 m
b) 2.50 m
c) 5.00 m
d) 7.50 m
Physics Force & Laws Of Motion Level: High School
Impulse
A batter hits a 0.140 kg baseball that was approaching him at 40.0 m/s and , as a result , the ball leaves the bat at 30.0 m/s in the direction of the pitcher . What is the magnitude of the impulse delivered to the baseball ?
a) 9.80 Ns
b) 1.40 Ns
c) 5.60 Ns
d) 7.00 Ns
Physics Force & Laws Of Motion Level: High School
Impulse
In a collision between two unequal masses , how does the impulse imparted to the smaller mass by the larger mass compare with the impulse imparted to the larger mass by the smaller one ?
a) it is larger
b) it is smaller
c) They are equal
d) The answer depends on how fast they are moving .
Physics Force & Laws Of Motion Level: High School
Impulse
A golf club exerts an average force of 1000 N on a 0.45 kg golf ball which is initially at rest . The club is in contact with the ball for 1.8 ms . What is the speed of the golf ball as it leaves the tee ?
a) 35 m/s
b) 40 m/s
c) 45 m/s
d) 50 m/s
Statistics Hypothesis Testing Level: High School
If is unknown when completing a hypothesis test about the population mean, then the best estimate for the unknown standard deviation is s. _____ T/F
Statistics Hypothesis Testing Level: High School
A sport writer wished to see if a football filled with helium travel farther, on average, than a football filled with air. To test this, the writer used 18 adult male volunteers. These volunteers were randomly divided into two groups of nine (9) subjects each. Both groups kicked the football to the recommended pressure. The mean yardage for group 1 was X (bar)1=30 yards, with a standard deviation of S1=8 yard. The mean yardage for group 2 was X(bar)2 =26 yards, with a standard deviation of S2=6 yard.Follow the five steps hypothesis testing to test whether there is a significant difference between the distance traveled by footballs filled with helium and with air at 95% level.
Statistics Hypothesis Testing Level: High School
A certain brand of oatmeal claims that eating their oatmeal product for breakfast will decrease your cholesterol level by an average of 12.5. To verify the claim, a laboratory selected 120 individuals with medium cholesterol level who regularly eat oatmeal for breakfast for certain period and found that the cholesterol level decreased by 12.1 with a standard deviation of 3.2. Assuming that the decrease in cholesterol levels in one month is normally distributed, follow the five steps hypothesis testing and test the validity of the oatmeal manufacturers claim at 95%.level
Physics Force & Laws Of Motion Level: High School
A 0.330 kg volleyball is thrown vertically downward with a speed of 0.150 m/s . It takes it 0.0655 s to reach the ground .What is the magnitude of its momentum just before it hits the ground ?
a) 0.212 kg x m/s
b 0.262 kg x m/s
c) 0.163 kg m/s
d) 0.0216 kg x m/s
Physics Force & Laws Of Motion Level: High School
Impulse
A golf club exerts an average force of 1000 N on a 0.045 kg golf ball which is initially at rest . The club in contact with the ball for 1.8 ms . What is the speed of the golf ball as it leaves the tee ?
a) 35 m/s
b) 40 m/s
c) 45 m/s
d) 50 m/s
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
Two air track carts move along an air track towards each other . Cart A has a mass of 450 g and moves toward the right with a speed of 0.850 m/s and air track cart B has a mass of 300 g and moves towards the left with a speed of 1.12 m/s. What is the total momentum of the system ?
a) 0.047 kg x m/s toward the right .
b) 0.719 kg x m/s toward the right .
c) 0.750 kg x m/s toward the right .
d) 0.750 kg m/s toward the left .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A firecracker breaks up into two pieces , one has a mass of 200 g and files off along the x –axis with a speed of 82.0 m/s and the second has a mass of 300 g and flies off along the y-axis with a speed of 45.0 m/s . What is the total momentum of the two pieces ?
a) 361 kg x m/s at 56.3 degrees from the x-axis .
b) 93.5 kg x m/s at 28.8 degrees from the x-axis .
c) 21.2 kg x m/s at 39.5 degrees from the x-axis .
d) 361 kg d m/s at 0.983 degrees from the x-axis .
Physics Work,Power & Energy Level: High School
Conservation of energy
A snowboarder coasts on a smooth track that rises from one level to another , If the snowboarder’s initial speed is 4 m/s , the snowboarder just makes it to the upper level and comes to rest . With a slightly greater initial speed of 5 m/s , the snowboarder is still moving to the right on the upper level . what is the snowboarder’s final speed in this case ?
a) 1 m/s
b) 2 m/s
c) 3 m/s
d) 4 m/s
Physics Work,Power & Energy Level: High School
Conservation of energy
What should the height of a slide in a park be so that a child will reach the bottom of the slide with a speed of 15.0 m/s ? Use g = 10.0 m/s squared .
a) 22.5 m
b) 15.1 m
c) 11.3 m
d) 10.5 m
Physics Work,Power & Energy Level: High School
The ratio of the potential energy to the kinetic energy of an object of mass m at a height of 40 m above ground level is 2:1 . What is the speed of the object at that point ? Use g = 10 m/s squared .a) 10 m/s
b) 20 m/s
c) 30 m/s
d) 40 m/s
