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Q 1/20
Score 0
A car traveling on a level road initially has 440 kJ of mechanical energy. After the brakes are applied for a few seconds, the car has only 110 kJ of mechanical energy. What best accounts for the missing mechanical energy?
30
Most of the missing mechanical energy has been converted to gravitational potential
energy.
Most of the missing mechanical energy has been converted to heat energy through friction.
Half the missing mechanical energy has been converted to heat energy, and the other
half has been destroyed.
Half the missing mechanical energy has been converted to kinetic energy, and the
other half has been converted to potential energy
Q 2/20
Score 0
Which statement best explains the difference between light waves traveling through a vacuum and light waves traveling through a medium?
30
Light waves traveling through a vacuum are transverse, but light waves traveling
through a medium are longitudinal.
Light waves traveling through a vacuum have a shorter wavelength than light waves
traveling through a medium.
Light waves traveling through a vacuum travel faster than light waves traveling through a medium.
Light waves traveling through a vacuum have no mass, but light waves traveling
through a medium have a mass greater than zero.
20 questions
Q.
A car traveling on a level road initially has 440 kJ of mechanical energy. After the brakes are applied for a few seconds, the car has only 110 kJ of mechanical energy. What best accounts for the missing mechanical energy?
1
30 sec
Q.
Which statement best explains the difference between light waves traveling through a vacuum and light waves traveling through a medium?
2
30 sec
Q.
An engineer is designing an instrument to examine the interior of a piece of wood without cutting it. The engineer decides to pass electromagnetic radiation through the wood to a detector on the other side. Which type of electromagnetic radiation would be most suitable for this investigation?
3
30 sec
Q.
Which of the following is not a benefit of nuclear energy?
4
30 sec
Q.
Which spring will have the most elastic potential energy?
5
30 sec
Q.
Which is true regarding wave A and wave B?
6
30 sec
Q.
Which of the following does not describe an exothermic reaction?
7
30 sec
Q.
Which of these best describes the energy transformation that occurs during the reaction in the picture?
8
30 sec
Q.
When the equation in the picture is balanced, what is the coefficient for oxygen?
9
30 sec
Q.
How does balancing chemical equations related to the conservation of mass?
10
45 sec
Q.
The picture represents a nuclear reaction. Which of the following best describes this reaction?
11
45 sec
Q.
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. Which of the following statements is best supported by this observation?
12
45 sec
Q.
What is the mass number of the missing particle in the reaction in the picture? Use the second picture to pick your answer.
13
45 sec
Q.
A form of technetium-99 has a half-life of approximately 6 hours. Would this reaction be considered fission or fusion?
14
45 sec
Q.
Identify points A and B on the wave in the picture.
15
45 sec
Q.
What is the difference between conduction and convection?
16
45 sec
Q.
As the waves travel from the left through the barrier, they produce a pattern on the right side. In a segment of this pattern, part of the wave tends to disappear. What phenomenon of waves causes this pattern to occur?
17
45 sec
Q.
The machine in the picture can be used to send gamma rays to destroy cells in specific parts of the body. Which statement best describes the use of the machine in medicine?
18
45 sec
Q.
The nucleus of a helium atom is an alpha particle, which consists of two protons and two neutrons. Which statement best explains how the two protons in an alpha particle can be bound so closely together?
