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3 years ago

A DC voltmeter may be used directly to measure a) frequency b)polarity c) power factor d) power

Physics

1 answer:

pshichka [43]3 years ago

6 0

A DC voltmeter may be used directly to measure B. Polarity

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This boy uses a force to lift a heavy rock. (He is carrying it.) What can the boy do if he wants to lift the same rock more quic

lutik1710 [3]

I nthink the answer is c may be

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3 years ago

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A car of mass 875 kg is traveling 30.0 m/s when the driver applies the brakes, which lock the wheels. The car skids for 5.60 s i

AleksAgata [21]

Explanation:

It is given that,

Mass of the car, m = 875 kg

Initial speed of the car, u = 30 m/s

Brakes are applied i.e. v = 0

The car skids for 5.60 s in the positive x - direction before coming to rest, t = 5.6

(a) Acceleration of the car, $a=\dfrac{v-u}{t}$

$a=\dfrac{0-30}{5.6}$

$a=-5.35\ m/s^2$

(b) Force, F = ma

$F=875\ kg\times -5.35\ m/s^2$

F = -4681.25 N

So, the force of 4681.25 N is acting on the car.

(c) Let x is the distance covered by the car. So,

$v^2-u^2=2ax$

$0-u^2=2ax$

$x=\dfrac{-u^2}{2a}$

$x=\dfrac{-(30\ m/s)^2}{2\times -5.35\ m/s^2}$

x = 84.11 meters

So, the distance covered by the car is 84.11 meters. Hence, this is the required solution.

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3 years ago

You travel in a circle, whose circumference is 8kilometers, at an average speed of kilometer/hour. If you stop at the same point

dimaraw [331]

You skipped over a number in the question, and you didn't tell me what my average speed is. Lucky for you, my average speed has NO EFFECT on the answer to the question.

When you calculate velocity, you only use the straight-line distance between the start-point and the end-point. It doesn't matter what route the thing took to get there, or how much ground it actually covered.

If I travel in a circle and stop at the same point I started from, then the size of the circle doesn't matter, and neither does my speed. The distance between my start-point and my end-point is zero, and my average velocity is zero.

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4 years ago

A column of soldiers, marching at 114 steps per minute, keep in step with the beat of a drummer at the head of the column. It is

kipiarov [429]

Answer:

length of column is 140.42 m

Explanation:

in 1 min the soldiers travels 114 steps

so to complete 1 step the time taken by the soldiers =

t = $\dfrac{1\ min}{114}$

t = $\dfrac{60}{114}$

t = 0.526 s

speed of sound = 343 m/s

length of the column = v × t

= 343 m/s × 0.526 s

= 140.42 m

hence the length of column is 140.42 m

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3 years ago

A ball rolls 60 centimeters along a sidewalk in 5 seconds what is the speed of the ball.

meriva

Answer:

12 cm/s

Explanation:

Quite simply, you are looking for cm/s

so 60 cm / 5s = 12 cm/s

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2 years ago

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