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mylen [45]
3 years ago
11

A student is trying to calculate the density of a can. He already knows the mass, but he needs to determine the volume as well.

Which of the following formulas can be used to calculate the volume of the can?
Physics
1 answer:
elena-14-01-66 [18.8K]3 years ago
6 0

Answer:

V=Bh

Explanation:

B h is used for rectangular solids and cylinders

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How far (in meters) will you travel in 3 minutes running at a rate of 6 m/s?
trasher [3.6K]
The formula for distance is speed times time.

So 3 times 6 would be 18 m/s
7 0
3 years ago
A machine produces 4,000 J of work in 5 seconds. how much power does the machine produce.
ad-work [718]

Explanation:

Power is defined as the work done per unit time or

P = \dfrac{\Delta W}{\Delta t}

\;\;\;\;= \dfrac{4000\:\text{J}}{5\:\text{s}} = 800\:\text{Watts}

5 0
2 years ago
An astronaut is traveling in a space vehicle that has a speed of 0.480c relative to Earth. The astronaut measures his pulse rate
Alexxandr [17]

Explanation:

The heart rate of the astronaut is 78.5 beats per minute, which means that the time between heart beats is 0.0127 min. This will be the time t measured by the moving observer. The time t' measured by the stationary Earth-based observer is given by

t' = \dfrac{t}{\sqrt{1 - \left(\dfrac{v^2}{c^2}\right)}}

a) If the astronaut is moving at 0.480c, the time t' is

t' = \dfrac{0.0127\:\text{min}}{\sqrt{1 - \left(\dfrac{0.2304c^2}{c^2}\right)}}

\:\:\:\:=0.0145\:\text{min}

This means that time between his heart beats as measured by Earth-based observer is 0.0145 min, which is equivalent to 69.1 beats per minute.

b) At v = 0.940c, the time t' is

t' = \dfrac{0.0127\:\text{min}}{\sqrt{1 - \left(\dfrac{0.8836c^2}{c^2}\right)}}

\:\:\:\:=0.0372\:\text{min}

So at this speed, the astronaut's heart rate is 1/(0.0372 min) or 26.9 beats per minute.

8 0
3 years ago
Which statement is true for electric field lines?
KiRa [710]
The best answer is D. field lines should always be crossing each other.
8 0
3 years ago
Read 2 more answers
As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit ____________ (increases,
Anestetic [448]

Answer:

Decreases, Increases

Explanation:

Resistance is parallel can be calculated using

1/Req = 1/R1 + 1/R2 + 1/R3 +....

Then, as more resistor is added in parallel the equivalent resistance is reduced.  

Let use a simple sample

Let all the resistor have equal resistances

Let say R = R1 = R2 = R3 =...Rn

Then, 1/Req = 1/R1 + 1/R2 + 1/R3 +....

1/Req = 1/R + 1/R + 1/R +.... 1/Rn

Req = R/n

Check attachment on how I got that.

This implies that, the equivalent resistance will always be less than the original resistance, since n>1

So, as n increases (I.e. as the number of resistance increases), the equivalent resistance reduces.

B. Now, to know if the current reduces or increases

Using Ohms law

V = iR

Then, I = V/R

So, let assume the voltage is constant, then, the current is inversely proportional to the resistance, so as we know that the resistance is reducing, then the current will be increasing.

So current increase as we add more resistor in parallel to a circuit

3 0
3 years ago
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