Physics Work,Power & Energy Level: High School
Potential energy is defined for which type(s) of forces ?a. Spring force .
b. Any non-conservative force .
c. Gravitational force .
d. Any conservative force .
e. All of the above .
f. Any force of type a ,c , or d .
g. Any force of type b ,c ,or d .
Physics Rotational Mechanics Level: High School
Under which of the following condition is BOTH the angular momentum and the linear momentum of a rigid body conserved ?a. The sum of the external forces equals zero .
b. The sum of the external torques equals zero .
c. The system is isolated .
d. All external forces are conservative .
e. The sum of internal forces equals zero .
Physics Force & Laws Of Motion Level: High School
A collision of a 10-kg body with a wall takes 0.01 –s . The collision force given by F(t) = 10^4 e^t Newtons causes a change in velocity of 10.1 m/s . What is the impulse imparted to the body ?a. 10 kg-m/s
b. 1010 kg-m/s
c. 0.101 kg-m/s
d. 10^4 kg-m/s
e. 101 kg-m/s
Physics Work,Power & Energy Level: High School
A meteorite strikes the Earth perpendicularly at a speed of 10^3 m/s . If the mass of the meteorite is 10^3 kg and the mass of the Earth is 6 x 10^24 kg , What is the magnitude of the change in the velocity of the Earth ?a. 1.29 x 10^-8 m/s
b. 1.67 x 10^-19 m/s
c. 1.67 x 10^-25 m/s
d. Since the collision is inelastic , the Earth does not change its velocity .
e. Since the collision is inelastic , momentum is not conserved and the velocity change cannot be calculated .
Physics Rotational Mechanics Level: High School
Centre of Mass
Find the center of mass of this two-body system. (Notice the notation for subscripts , eg , msub 1 = letter m with a sub 1 notation.)msub 1 = 2-kg .
rsub 1 = (2,6)
msub 2 = 3-kg
rsub 2 = (2,-4)
a. (2,24)
b. (0,26)
c. (24,0)
d. (2,0)
e. (10,0)
f. None of the above .
Physics Work,Power & Energy Level: High School
Suppose that two masses , consulting an isolated system are involved in a collision. Prior to the collision, mass ,m , has a speed of 10 m/s and mass , m , is at rest . After the collision , m has a speed of 6 m/s and m’ has a speed of 8 m/s . The masses of the two bodies are equal . What can be said about the collision ?a. It conserves momentum .
b. It does NOT conserve momentum .
c. If conserves energy .
d. Both a and c are true .
e. Both b and c are true .
f. All of the above are true .
Physics Work,Power & Energy Level: High School
In an experiment , two balls of equal radii and different masses are dropped from a height 20-m above the ground . Both balls hit the ground at the same time . Which of the following statements BEST describes the potential energies of the two balls before they are dropped ?a. The ball with the smaller mass has greater potential energy .
b. The ball with the larger mass has the greater potential energy .
c. Both have the same potential energy .
d. The value of potential energy CANNOT be determined until a zero potential energy level is selected .
e. Based on d , either a , b , or c may be true .
f. None of the above are true .
Physics Work,Power & Energy Level: High School
For the pendulum shown , one can MOST accurately find the speed of the bob at the bottom of its arc by using :a. delta è /delta t = -omega èmax sin(omega t + indefinite )
b. Conservation of linear momentum .
c. Conservation of angular momentum .
d. Conservation of mechanical energy .
e. Conservation of Torque .
f. All of the above .
Physics Work,Power & Energy Level: High School
What criteria must be met for a system if total energy (defined as kinetic and potential ) is conserved ?a. The center of mass of the system moves with constant acceleration .
b. The sum of all internal forces equals zero .
c. The sum of all external torque is zero .
d. The sum of all external forces is zero .
e. Only conservative forces do work .
f. Only b ,c or d are correct .
Physics Rotational Mechanics Level: High School
A sphere rolling down a plane :a. Has translational kinetic energy .
b. Has rotational kinetic energy .
c. Has the potential to do work .
d. All of the above .
e. Only a and b above .
Physics Work,Power & Energy Level: High School
Potential energy is defined for which type(s) of forces ?a. Spring force .
b. Any non-conservative force .
c. Gravitational force .
d. Any conservative force .
e. All of the above .
f. Any force of type a , c , or d .
g. Any force of type b ,c ,or d .
Physics Electromagnetic Waves Level: High School
At a given instant in time , a traveling EM wave is noted to have its maximum magnetic field pointing west and its maximum electric field pointing south .In which direction is the wave traveling ?
(a) downward
(b) upward
If the rate of energy flow is 2.30E2 W/m2 , what is the maximum value for the Electric field ?
What is the maximum value for the Magnetic field ?
Physics Electromagnetic Waves Level: High School
A high energy pulsed laser emits a 1.5 ns long pulse of average power 1.8E 11W . The beam is 1.7 E-3 m in radius .Determine the energy delivered in each pulse .
Determine the rms value of the electric field .
Physics Electromagnetic Waves Level: High School
The amplitude of the B field of an EM wave is 2.3 E-7T .What is the amplitude of the E field ?
What is the average power per unit area of the EM wave ?
Physics Electromagnetic Waves Level: High School
A 10.7 mW laser puts out a narrow beam 1.50 mm in diameter.What is the average (rms) value of E in the beam ?
What is the average (rms) value of B in the beam ?
