Physics Revision 2- section B
1.
Earth is 1.50×1011 m from the Sun and has a
period of 365.2 days. Mars is an average of 2.28×1011
m from the Sun. The orbital period of Mars in Earth
years is…..
2.
Two spheres are 1.02 km apart. One of the
spheres has a mass of 57.0 kg, and the gravitational
force between the spheres is 1.79×10 -14N. The mass
of the other sphere is…..
3.
A planet orbits the Sun at a distance of
2.87×109 km. The mass of the Sun is 1.99×1030 kg.
a. What is the orbital period of the planet in earth
years?
b. What is the orbital speed of the planet?
4. The primary coil of a transformer has 725 loops
and is connected to a 120.0-V source. How many
loops would be needed in the secondary coil to
supply 555 V.
5.
A wire is connected across a circuit with 5.50
Ω of resistance. If 1.12 m of the wire is moving
perpendicularly through a magnetic field of 0.250 T
and the resulting current through the wire is 1.34×10
-2 A, the speed of the wire is….
6.
An AC generator requires 225 J of mechanical
energy per second to produce 175 W of effective
power.
A)The efficiency of the generator is ……………%.
b) If the total resistance in the wire in the generator
is 15.0 Ω, then the maximum current produced is……
A.
8.
A 220-W transformer has an input voltage of
35 V and an output voltage of 12 V. The ratio of turns
in the primary coil to turns in the secondary coil is…
9.
A wire carries a current of 6.0 A. The wire is
at right angles to a uniform magnetic field, and 0.80
m of the wire is in the field. The force on the wire is
0.62 N. What is the strength of the magnetic field?
10.
A wire is at right angles to a uniform
magnetic field of 0.400 T. The current through the
wire is 4.00 A. What is the force that acts on the wire
when 60.0 cm is in the field?
11.
A wire carries a current of 12 A. The wire is at
right angles to a uniform magnetic field that exerts a
force of 0.50 N on the wire when 2.0 m of the wire is
in the field. What is the strength of the magnetic
field?
12.
A wire is at right angles to a magnetic field
that exerts a force of 2.4 N on the wire. There is a
current of 8.6 A through the wire. The magnetic field
is 0.66 T. What length of wire is in the field?
13.
A high-speed electron travels at right angles
to a magnetic field of 0.420 T. The electron is
traveling at 3.46×107 m/s. What is the magnitude of
force acting on the electron?
14.
A section of wires and resistors in a circuit
has a total resistance of 6.0 Ω and a potential
difference of 120 V. If 0.40 m of the wire is placed in a
uniform magnetic field at right angles to the field, the
force on the wire is 0.50 N. What is the strength of the
magnetic field?
7.
If the average power dissipated by an electric
light is 150 W, the maximum power is……………. W
15.
A proton travels at 1.0×10 5 m/s,
perpendicular to a uniform magnetic field of 5.5×10
−5 T. What is the magnitude of the acceleration of the
proton?
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