Homework Help: Physics 11 Final exams Practice

1. Jan 27, 2014

ovechkin1313

1. The problem statement, all variables and given/known data

22. A 5.00 x 10^4 kg shuttle is orbiting the earth 2.45 x 10^7 m above its surface. What is the earths gravitational field strength at this height.
a.)9.80m/s^2 b.) 1.29m/s^2
c.)0.418 m/s^2 d.)0.39m/s^2

23. What is the force of gravity between the shuttle and the earth in #22
a.)19700 N b.)20900 N c.) 49000 N d.) 64600 N

39. A light bulb 30 cm in front of a convex lens of focal length 20cm. If the light bulb is 5cm high, what is the height of the image?
a.) 5cm b.) 10cm

c.) 15cm d.) 60cm

40. An object is placed 25 cm in front of a convex mirror of focal length 8 cm. Where is the image?
a.) 3.1cm in front of the mirror
b.) 12cm in front of the mirror
c.) 12cm behind the mirror
d.) there is no image

41. a light bulb 30cm in front of a convex lens of focal length 20cm. The image is 60cm from the lens. What is the magnification of the image?
a.) -2
b.) 2
c.)-1/2
d.)1/2

2. Relevant equations

3. The attempt at a solution

I have no clue on these questions.. I used Fg=G(M) divided by r2

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2. Jan 27, 2014

haruspex

So post what you did.

3. Jan 27, 2014

castrodisastro

for number 41

Do you know what the Lens Equation and Magnification equation are?