Physics, 04.02.2020 02:04 karlamiddleschool

17)
in which situation is there no work being done?
a) a car being pushed 100 m
b) a 25 n force applied over 6 meters
c) a mouse pushing a crumb across the floor
d) a 10 n force applied to a stationary wall

19. the wattage of speaker describes the rate at which energy is converted from electrical energy to sound energy. this is the description of which of these?
a) energy
b) power
c) transformation
d) work

20)
a bodybuilder lifts a certain weight up and down. if the body builder does it in less time, which of these statements is most accurate?
a) the body builder uses both the same energy and power.
b) the body builder uses both more energy and more power.
c) the body builder uses the same energy and but more power.
d) the body builder uses the same power and but more energy.

21. students in a physical education class practiced rope climbing. students gripped a rope that hung from the ceiling and lifted themselves up the rope using only their arms. what must be measured to determine the power output of the climbers?
a) tension on the rope and the final height
b) body mass, final height, and the tension on the rope
c) tension on the rope and the time required to complete the climb
d) body mass, final height, and the time required to complete the climb

31. ocean waves travel in to the beach at an average velocity of 2.5
m
s
. if these waves come in 4 seconds apart, what is the average distance between the wave peaks, considering the formula v=d/t ?
a) 0.625 m
b) 1.6 m
c) 5.0 m
d) 10.0 m

Answers: 2

Show answers

Another question on Physics

Physics, 21.06.2019 22:30

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

Answers: 2

Answer

Physics, 22.06.2019 06:00

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

Answers: 3

Answer

Physics, 22.06.2019 06:20

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

Answers: 1

Answer

Physics, 22.06.2019 14:00

Una carga puntual de 3 x 10-6 c se coloca a 12 cm de una segunda carga puntual de - 1,5 x 10-6 c. calcular la magnitud fuerza eléctrica entre las cargas

Answers: 2

Answer

You know the right answer?

17)
in which situation is there no work being done?
a) a car being pushed 100 m
...

Questions