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chawki
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Homework Statement
a) How many micrograms are equal to one kilogram?
b) What is the power dissipation of a light bulb of the kind commonly used in households? (In
your answer, give the order of magnitude only; the exact value is not required.)
c) By what factor will the kinetic energy of an object increase when its velocity increases by
50 %?
d) During its flight through air, a golf ball is affected by the following forces (select the
correct alternative and render the capital letter denoting it on your answer sheet):
A) gravity only
B) gravity and impact force
C) gravity, impact force and air resistance
D) gravity and air resistance
E) impact force and air resistance
e) Estimate the total consumption of fuel of all passenger cars in the US during one year.
f) A tape measure of steel has been manufactured and calibrated at a temperature of 20 °C.
When a measurement is performed using this tape measure at a temperature of 29 °C, the
results are (select the correct alternative and render the capital letter denoting it on your
answer sheet)
A) too great
B) too small
C) equally accurate as the measurement results at 20 °C.
Homework Equations
The Attempt at a Solution
a) 109 micrograms.
b) P=V*I
c) ehhh 1/2*m*V2 ?
d) D
e)
f) C