Physics 105| Final Exam

Question 1 of 10

10

A person travels south at a constant speed of 3 m/s in a straight line from town A to town B. Then he goes back at a constant speed of 7m/s from town B to town A in a straight line. Find the average speed in m/s during the entire trip.

Select one of the following:

2.71 m/s
5.09 m/s
1.53 m/s
2.24 m/s
4.20 m/s

Explanation

Question 2 of 10

10

A 3.0 kg box slides down a 20.0-degree incline with an initial speed of 4.5 m/s. The coefficient of kinetic friction between the box and the incline is 0.55. What is the acceleration of the block ( in m/s^2 )?

Select one of the following:

1.71 down
1.71 up
0
3.35 up
3.35 down

Explanation

Question 3 of 10

10

If Two objects M1, M2 (M1=M2 ) are connected by a light inextensible cord which is attached to the ceiling of an elevator that is accelerating upward at 2 m/s^2, the ration T/N is:

Select one of the following:

5/3
2
1
3/2
1/2

Explanation

Question 4 of 10

10

With a 307 J of kinetic energy, a 2 kg ball starts sliding up a rough ramp with an inclination of 30°. How far (in m) will the ball slide up the ramp knowing that the coefficient of kinetic friction between it and the ramp is 0.4?

Select one of the following:

18.5
0.8
3.2
10.2
1.2

Explanation

Question 5 of 10

10

A traffic light hangs from a pole as shown in the figure. The uniform aluminum pole AB is 7.2 m long and has a mass of 6.0 kg. The mass of the traffic light is 21.5 kg. Find the tension in the horizontal massless cable CD?

Select one of the following:

608 N
363 N
570 N
370 N
408 N

Explanation

Question 6 of 10

10

A rectangular block of mass m is placed in a fluid and acted upon by a force F such that the block is fully submerged and hangs in static equilibrium. If the density of the block is twice that of the fluid, the magnitude of the force F is:

Select one of the following:

mg
mg/2
3mg
2mg
zero

Explanation

Question 7 of 10

10

Consider that your average blood pressure is (1.33 N/cm^2 ) and your blood flow rate is (105 cm^3/s ). The energy your heart does provide in one day is used to lift a 72 kg box vertically to a height of h. Calculate the height h (in m).

Select one of the following:

308
3
12
94
171

Explanation

Question 8 of 10

10

At t=0, the activity of sample Q is 8 mCi and that of sample W is 2 mCi. After 13 weeks, the two samples have the same activity of 0.25 mCi. The ratio of the mean lifetime of W to the mean lifetime of Q is?
(Recall that 1 Ci=(3.7*10^10 Bq ).

Select one of the following:

3/4
3/2
5/3
5/4
2/3

Explanation

Question 9 of 10

10

The radioactive Iodine -131, which has a half-life of 8.02 days, is used for the diagnosis of the Thyroid gland. A patient was administered 10 micrograms of radioactive Iodine -131. After 3 days, the amount (in micrograms) remaining in his body is approximate: (Recall that ( 1 Ci=3.710^10 Bq, NA=6.0210^23 ).

Select one of the following:

8.1
7.7
4.4
9.2
6.8

Explanation

Question 10 of 10

10

Two radioactive samples A and B with half-lives TA and TB=2TA. Assuming the initial numbers of both samples are equal, which of the following statements is correct?

Select one of the following:

Sample A decays faster than sample B.
The initial activities of A and B are the same.
Sample A decays slower than sample B.
λB = 2λA
None of the statements is correct.

	Created by Fuad abualhaj almost 3 years ago

Quiz on Physics 105| Final Exam, created by Fuad abualhaj on 12/09/2021.

Physics 105| Final Exam

Physics 105| Final Exam

Question 1 of 10

A person travels south at a constant speed of 3 m/s in a straight line from town A to town B. Then he goes back at a constant speed of 7m/s from town B to town A in a straight line. Find the average speed in m/s during the entire trip.

Select one of the following:

Explanation

Question 2 of 10

A 3.0 kg box slides down a 20.0-degree incline with an initial speed of 4.5 m/s. The coefficient of kinetic friction between the box and the incline is 0.55. What is the acceleration of the block ( in m/s^2 )?

Select one of the following:

Explanation

Question 3 of 10

If Two objects M1, M2 (M1=M2 ) are connected by a light inextensible cord which is attached to the ceiling of an elevator that is accelerating upward at 2 m/s^2, the ration T/N is:

Select one of the following:

Explanation

Question 4 of 10

With a 307 J of kinetic energy, a 2 kg ball starts sliding up a rough ramp with an inclination of 30°. How far (in m) will the ball slide up the ramp knowing that the coefficient of kinetic friction between it and the ramp is 0.4?

Select one of the following:

Explanation

Question 5 of 10

A traffic light hangs from a pole as shown in the figure. The uniform aluminum pole AB is 7.2 m long and has a mass of 6.0 kg. The mass of the traffic light is 21.5 kg. Find the tension in the horizontal massless cable CD?

Select one of the following:

Explanation

Question 6 of 10

A rectangular block of mass m is placed in a fluid and acted upon by a force F such that the block is fully submerged and hangs in static equilibrium. If the density of the block is twice that of the fluid, the magnitude of the force F is:

Select one of the following:

Explanation

Question 7 of 10

Consider that your average blood pressure is (1.33 N/cm^2 ) and your blood flow rate is (105 cm^3/s ). The energy your heart does provide in one day is used to lift a 72 kg box vertically to a height of h. Calculate the height h (in m).

Select one of the following:

Explanation

Question 8 of 10

At t=0, the activity of sample Q is 8 mCi and that of sample W is 2 mCi. After 13 weeks, the two samples have the same activity of 0.25 mCi. The ratio of the mean lifetime of W to the mean lifetime of Q is? (Recall that 1 Ci=(3.7*10^10 Bq ).

Select one of the following:

Explanation

Question 9 of 10

Select one of the following:

Explanation

Question 10 of 10

Two radioactive samples A and B with half-lives TA and TB=2TA. Assuming the initial numbers of both samples are equal, which of the following statements is correct?

Select one of the following:

Explanation

At t=0, the activity of sample Q is 8 mCi and that of sample W is 2 mCi. After 13 weeks, the two samples have the same activity of 0.25 mCi. The ratio of the mean lifetime of W to the mean lifetime of Q is?
(Recall that 1 Ci=(3.7*10^10 Bq ).