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3 years ago

A weightlifter is holding a 200-kg barbell at a height of 1

Physics

1 answer:

nydimaria [60]3 years ago

7 0

Answer:

0 J

Explanation:

The weightlifter will have performed some work raising the mass to its current height, he is performing no work at all while holding it there.

___

The mass is not moving through some distance, so the product of force and distance is zero.

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Gravity is affected by (2 points)

Tanya [424]

Answer:

Mass and distance

Explanation:

5 0

3 years ago

A sound source of frequency f moves with constant velocity (less than the speed of sound) through a medium that is at rest. A st

ANTONII [103]

Answer:

The correct answer is d

Explanation:

In this exercise they ask us which statement is correct, for this we plan the solution of the problem, this is a Doppler effect problem, it is the frequency change due to the relative speed between the emitter and the receiver of sound.

The expression for the Doppler effect of a moving source is

f ’= (v / (v- + v_s) f

From this expression we see that if the speed the sound source is different from zero feels a change in the frequency.

The correct answer is d

7 0

3 years ago

A magnetic field is uniform over a flat, horizontal circular region with a radius of 1.50 mm, and the field varies with time. In

Daniel [21]

Answer: $81.57\mu V$

Explanation:

Given

radius of circular region r=1.50 mm

$A=\pi r^2=7.069\times 10^{-6}\ m^2$

Magnetic Field $B=1.50\ T$

time t=130 ms

Flux is given by

$\phi =B\cdot A$

change in Flux $d\phi =(B_f-B_i)A$

Emf induced is $e=\frac{\mathrm{d} \phi}{\mathrm{d} t}$

$e=\frac{(1.5)\cdot 7.069\times 10^{-6}}{130\times 10^{-3}}$

$e=81.57 \mu V$

3 0

4 years ago

What is the distance traversed by the particle between 0 seconds and 6 seconds?

ad-work [718]

Answer:

I dont know to be honest

Explanation:

i dont know to be honest

5 0

3 years ago

Two students, Jenny and Cho, are investigating motion.

IgorLugansk [536]

Answer:

1: a measuring instruments the students should use for time is a stopwatch

2: a measuring instruments the students should use for distance is a measuring tape

Explanation:

pls mark brainliest

8 0

2 years ago