# Phy 111 - Elementary Mechanics

14 Questions | Total Attempts: 376  Settings  For proper understanding, call Mr. Albert 08032688639

• 1.
Assuming that the Earth is a uniform sphere of radius 6.4 x 106 m and mass 6.0 x 1024 kg, find the gravitational field strength g at a point on the surface of the earth
• A.

19.77ms-2

• B.

199.10ms-2

• C.

9.77ms-2

• D.

100.7ms-2

• 2.
Assuming that the Earth is a uniform sphere of radius 6.4 x 106 m and mass 6.0 x 1024 kg, find the gravitational field strength g at a point: at height 0.50 times the radius of above the Earth's surface
• A.

14.314ms-2

• B.

24.134ms-2

• C.

10.314ms-2

• D.

4.34ms-2

• 3.
What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth
• A.

gR^2/(R+h)2(gR2)/(R+h)2

• B.

GR/(R+h)2

• C.

GR/(R+h^2)2

• D.

GR/(R^2+h)2

• 4.
The instrument used for experimental determination of the value of the universal gravitational constant G is
• A.

Galilio’s telescope

• B.

Ballistic pendulum

• C.

Newton’s balance

• D.

Cavendish balance

• 5.
A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?
• A.

The passer-by is stationery relative to the passenger

• B.

Both observers are in motion relative to each other

• C.

The passenger is in motion relative to the passer-by

• D.

The passer-by is in motion relative to the passenger

• 6.
Which of the following statements is not correct about reference frames?
• A.

Any reference frame moving at constant velocity with respect to an inerial refernce frame is also inertial

• B.

In non-inertial reference frames the motion of objects depend only on the interactions of constituent particles among themselves

• C.

If the coordinate axes of a reference frame attached to an object remain fixed in space then the object is at rest

• D.

Laws of physics are invariant in inertial reference frames

• 7.
What are the dimensions of power (time rate of change of expending energy)
• A.

MLT−2

• B.

ML2T−3

• C.

ML2T−2

• D.

M2L2T−3

• 8.
Two forces act on a point object as follows: 100N at 170derees and 100N at 50degrees. Find their resultant force
• A.

100 N at 110o

• B.

110 N at 50o

• C.

110 N at 100o

• D.

100 N at 50o

• 9.
The speed of 90 hm/hr is equal to ------------------ m/s
• A.

324

• B.

90

• C.

15

• D.

25

• 10.
Type question here
• A.

• B.

• C.

• D.

• 11.
Identify the instrument above, which always spin continuously when torqued?
• A.

Horoscope

• B.

Stetoscope

• C.

Gyroscope

• D.

Spinoscope

• 12.
A monkey in a perch 20m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5m/s beneath the tree. How far behind him in metres does the coconut hit the ground?
• A.

3.03

• B.

2.25

• C.

3.06

• D.

2.02

• 13.
A monkey in a perch 20 m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5 m/s beneath the tree actually intending to hit the toes of the zoo keeper, how early in seconds should the coconut be dropped by the monkey
• A.

1.35

• B.

1.50

• C.

2.04

• D.

3.02

• 14.
Which one do you like?
• A.

Option 1

• B.

Option 2

• C.

Option 3

• D.

Option 4

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