If you were to move into outer space far from any stars or planets,
your mass would change, but your weight would not change.
your weight would change, but your mass would not change.
both your weight and mass would change.
neither your weight nor your mass would change.
Find the wavelength (in nm) of a 7.75eV photon.
136nm
160nm
176nm
191nm
Why do heavy nuclei contain more neutrons than protons?
Neutrons are radioactive, and so are heavy nuclei.
Neutrons are lighter than protons.
Neutrons are heavier than protons.
Neutrons dilute the electric repulsion of the protons.
The reactance of a capacitor is 7.0kΩ at a frequency of 0.20kHz. What is the capacitance?
0.114μF
0.71μF
4.5μF
0.161μF
A circular coil of 60 turns and radius 2 cms is placed with its plane oriented at 90° to a magnetic field of 0.1 T. The field is now increased at a steady rate, reaching a value of 0.8T after 7 seconds. What EMF is induced in the coil?
0.0099V
0.012V
0.0075V
0.015V
Which of the following is an accurate statement?
Magnetic field lines have as their sources north and south poles.
A magnetic field line is, by definition, tangent to the direction of the magnetic force on a moving charge at a given point in space.
The magnetic force on a moving charge does not change its energy.
The magnetic force on a current carrying wire is greatest when the wire is parallel to the magnetic field.
A Carnot engine is operated as an air conditioner to cool a house in the summer. The air conditioner removes 14kJ of heat per second from the house, and maintains the inside temperature at 293K, while the outside temperature is 375K. The power required for the air conditioner under these operating conditions, in SI units, is closest to:
6300
4700
5500
339
A uniform 700kg beam, 6m long, is freely pivoted at P. The beam is supported in a horizontal position by a light strut, 5m long, which is freely pivoted at Q and is loosely pinned to the beam at R. A load of mass is suspended from the end of the beam at S. A maximum compression of 19,000N in the strut is permitted, due to safety. In Figure below, the maximum mass M of the load is closest to:
231kg
425kg
619kg
1125kg
An 8g bullet is shot into a 4.0kg block, at rest on a frictionless horizontal surface. The bullet remains lodged in the block. The block moves into a spring and compresses it by 9.4cm. The force constant of the spring is 1000N/m. In Figure below, the initial velocity of the bullet is closest to:
800 m/s
710m/s
770m/s
740m/s
Dick and Jane stand on a platform of negligible weight, as shown in Figure below. Dick weighs 500N and Jane weighs 400N. Jane is supporting some of her weight on the end of the rope she is holding. What is the downward force she is exerting on the platform?
0
50N
100N
300N
Define the following physics quantities:
(a) torque, (b) angular momentum, (c) moment of inertia, (d) specific heat, (e)capacitance, (f) current, (g) inductance, (h) magnetic dipole moment, (i) angular wave number, and (j) Poynting vector.
Describe Faraday’s law of induction and name some real life applications in today’s word.
Describe the three heat transfer mechanisms between a system and its environment: conduction, convection, and radiation.
Discuss the Doppler’s effect and its real life applications.
Write down and describe the four Maxwell’s equations in free space.
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