Tema
Q:
A convex lens produces an inverted image
magnified four times. If the distance of the
object from the lens is 5 cm , what is the focal
length of the lens? [ 4 cm ]
Q:
2) If a net force acts on an object, the object may change speed, change direction or do neither.
True
False
Q:
A convex lens produces an inverted image
magnified four times. If the distance of the
object from the lens is 5 cm , what is the focal
length of the lens?
Q:
3.1 Define equilibrium of forces,
3.2 For the system of forces below, find magnitude and direction of the resultant.
Q:
The mechanical advantage of a wedge is 7 . If I apply a force of 200 N to the object,
output force?
Q:
8. It takes 130 N to push a 52 kg object up an inclined plane.
a. Calculate the gravitational force on the object
b. This is the input / output force.
Q:
An avalanche demonstrates what kind of energy conversion?
A. Kinetic energy to heat energy
B. Chemical potential energy to heat energy
C. Kinetic energy to gravitational potential energy
D. Gravitational potential energy to kinetic energy
Q:
Two physics students are moving books from the floor to a table. Each student lifts 14 books that
each have a mass of 1.1 kg up to a table with a height of 0.75 m . Student A lifs the books in 18.2
seconds. Student B lifts the books in 24.5 seconds.
a. Which student does the most work? Explain how you know.
Q:
A BMW motor car with mass of 1,2 ton accelerates from rest uniformly from
rest up a gradient 1 of 3 and reaches a speed of \( 72 \mathrm{~km} / \mathrm{h} \) after 3 minutes.
Calculate:
1.2.1 The acceleration of the BMW.
1.2.2 The kinetic energy that the BMW possess after 3 minutes.
1.2.3 Potential energy after 3 minutes.
Q:
Noz mase 1200 t smanji brzinu sa \( 10 \frac{\mathrm{~m}}{\mathrm{~s}} \) na \( 4 \frac{\mathrm{~m}}{\mathrm{~s}} \) u toku 3 minute. Odredi silu kocenja
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