1.)What is the kinetic energy of a 0.50 g insect traveling in a straight line at
ID: 2269584 • Letter: 1
Question
1.)What is the kinetic energy of a 0.50 g insect traveling in a straight line at 5.0 m/s? a.6.25J b.1.25J c.5.0J d.250J
2.)Mechanical energy is defined as the sum of which of the following? a.kinetic, potential, and radiant energy. b.kinetic potential, and nuclear energy. c.all forms of kinetic energy. d.Kinetic and all forms of potential energy.
3.)Which of the following are not units of power? a.hp b.J c.W d.J/s
4.)Which of the following equations can be used to directly calculate the change in an objects momentum? a.p=mv b.p=m/v c.p=F delta t d.delta p=F delta t
5.)Two skaters stand facing each other. One skaters mass is 60 kg, and the other's mass is 72 kg. If the skaters push away from each other without spinning, a.the lighter skater has less momentum b.their momenta are equal but opposite c.hteir total momentum doubles d.their total momentum decreases
6.)In an inelastic collision between two objects with unequal masses, a.the total momentum of the system will increase b.the total momentum of the system will decrease c.the total kinetic energy of one object will increase by the amount that the kinetic energy of the other object decreases d.the momentum of one object will increase by the amount that the momentum of the other object decreases.
7.)An object that revolves about a single axis at a constant speed has a.centripetal acceleration b.tangential speed c.uniform circluar motion d.all of the above
8.)The degree to which an object attracts other objects is measured by the objects a.gravitational mass b.inertial mass c.gravitational field strength d.weight
9.)How would the speed of Earth's orbit around the sun change if Earth's mass increased by 4 times? a.it would increase by a factor of 2. b. it would increase by a factor of 4. c.it would decrease by a factor of 2. d.the speed would not change.
10.)A girl pushes a box that has a weight of 450 N up an incline, If the girl exerts a force of 150 N along the incline, what is the mechanical advantage of the incline? a.0.33 b.3.0 c.300 d.33%
11.)When a gas is poured out of one container into another container, which of the following does not occur? a.the gas flows into the new container b.the gas changes shape to fit the new container c.the gas spreads out to fill the new container d.the gas keeps its origional volume
12.)Which of the following statements is true according to Pascal's principle? a.fluids exert equal pressure in all directions b.slower moving fluids exert less pressure on their surroundings c.fluids diplace a volume equal to twice that of any object placed in them d.If the pressure is increased at one point in a fluid it must decrease by the same amount in another part of the fluid
13.)WHat happens when a person blows between two papewr cups that are hung by strings 10 cm apart? a.the cups move toward each other b.the cups move away from each other c.the cups do not move d.the cups move upward
14.)If two small beakers of water, one at 70 degrees Celcius and the other at 80 degrees Celcius, are emptied into a large beaker, what is the final temperature of the water? a.less that 70 degrees C b.greater than 80 degrees C c.between 70 degees and 80 degrees C d.the temperature will fluctuate.
15.)which of the following describes a substance in which the temperature and pressure remain constant while the substance experiences an inward transfer of energy? a.gas b.liquid c.solid d.substance undergoing a change of state
16.)an ideal gas system is maintained at a constant volume of 4 L. If the pressure is constant, how much work is done by the system? a.0 J b.5 J c.8 J d.30 J
17.)Which of the following is a thermodynamic process in which a system returns to the same conditions under which it started? a.an isovolumeric process b.an isothermal process c.a cyclic process d.an adiabatic process
18.)When a drop of ink mixes with water, what happens to the entropy of the system? a.the systems's entropy increases and the total entropy of the universe increases b.the system's entropy decreases and the total entropy of the universe increases. c.The system's entropy increases and the total entropy of the universe decreases d. the system's entropy decreases and the total entropy of the universe decreases.
19.)A mass-spring system can oscillate with simple harmonic motion because a compressed or stretched spring has which kind of energy? a.kinetic b.mechanical c.gravitational potential d.elastic potential
20.)By what factor should the length of a simple pendulum be changed in order to triple the period of vibration? a.3 b.6 c.9 d.27
21.)When a mechanical wave's amplitude is reduced by half, the energy the wave carries in a given time interval is, a.doubled b.increased by a factor of 1.4 c.decreaced to one-half d.decreased to one-fourth
22.)WHich of the following types of interference will occur when the pulses in the figure below meet? a.no interference b.constructive interference c.destructive interference d.total interference **it is a wave like figure starting in a straight line then moving up high, then down and flat again with an arrow pointing to the right underneath the high hump then after the straight line there is a second bump lower than the first with a line underneath pointing to the left, then the line goes flat again**
23.)Pitch depends on the ____ of a sound wave? a.frequency b.amplitude c.power d.speed
24.)At a distance of 3m, the intensity of a sound will be ____ the intenisty it was at a distanc eof 1m. a.one-ninth b.one-third c.3 times d.9 times
25.)When an air column vibrates in a pipe that is closed at one end, a. all harmonics are present b. no harmonics are present c. only odd harmonics are present d. only even harmonics are present
Thank you, thank you, thank you, I know it is alot. I truly appreciate all your help! XOXO god bless:)))
Explanation / Answer
1.none of the answers .it must be 6.25 mJ
2.d
3.b
4.d
5.c
6.d
7.d
8.a
9.a
10.b
11.d
12.none
13.a
14.c
15.d
16.a
17.c
18.a
19.d
20.c
21.d
22.c
23.a
24.a
25.c
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