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Authored by Samir Samir Ashour

Physics

KG - Professional Development

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12 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

1. When determining whether a rigid body is in equilibrium, the vector sum of the gravitational forces acting

on the individual particles of the body can always be replaced by a single force acting at:

a point on the boundary

the geometrical center

the center of mass

the center of gravity

any of the above

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

2. A 7 m- long beam of negligible mass is hanged horizontally and is supported at each end by vertical cables. A

person of unknown weight is sitting on it somewhere between the cables. The tension in the left cable is 300 N,

and that in the right cable is 400 N. How far is the person sitting from the left cable?

3 m

4 m

7 m

6 m

5 m

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Find the tension T2 in the left hand rope shown in the figure, for the case  where 

 θ2=60°,  θ3=30°\theta_2=60\degree,\ \ \theta_3=30\degree  and W= mg = 50 N.

50 N

100 N

43 N

87 N

29 N

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

A 1000- N block is suspended as shown. The beam AB is weightless and is hinged to the wall at A. The beam is 10 m long. The 4-m-long horizontal cable is attached to the midpoint of the beam AB from a point 3 m above point A on the wall. Find the tension in the horizontal cable,

667 N

2000 N

375 N

2670 N

1000 N

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

A rectangular, uniform chest of drawers 4- feet high and 3-feet wide is standing on a ramp as shown. There is enough friction so that it cannot slide. What is the largest angle q for which the chest will not topple over?

36.9o

53.1o

41.4o

48.6o

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The magnitude of the acceleration of gravity for a planet in orbit around the Sun is proportional to:

the mass of the planet

the mass of the Sun

the distance between the planet and the Sun

the reciprocal of the distance between the planet and the Sun

the product of the mass of the planet and the mass of the Sun

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A starship of mass m is traveling between a pair of binary stars that are a distance R apart. The mass of star 2 is exactly twice the mass of star 1. How far from star 1 will the gravitational force on the starship be equal to zero?

Express the answer in terms of R.

1.41R

2R

R/0.41

R/2

R/2.41

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