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Nataliya [291]
3 years ago
13

A container has 79000cm3 of mercury. Find the mass of mercury if the density is 13.6g/cm3

Physics
1 answer:
ZanzabumX [31]3 years ago
6 0

Explanation:

Density is mass divided by volume:

D = M / V

Given V = 79000 cm³ and D = 13.6 g/cm³:

13.6 g/cm³ = M / (79000 cm³)

M = 1,074,400 g

M = 1,074 kg

Round as needed.

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Problem 4: a long wire carries current towards east. a positive charge moves westward and just north from the wire. what is the
Alex787 [66]
The direction of the force experienced by the positive charge is upward.

We can use the right-hand rule to understand the direction of the Lorentz force acting on the charge: let's put the thumb in the same direction of the current in the wire (eastward), while the other fingers "wrap themselves" around the wire. These other fingers give the direction of the Lorentz force in every point of the space around the wire. Since the charge is located north of the wire, in that point the fingers are directed upward, so the positive charge experiences a force directed upward.
(if it was a negative charge, we should have taken the opposite direction)
4 0
3 years ago
(1) Develop an equation that relates the rms voltage of a sine wave to its peak-to-peak voltage. a. If a sine wave has a peak-to
Aleks04 [339]

Answer:

(A) Equation will be v=v_msin\omega t=0.75sin(18840t)

(B) RMS value of voltage will be 0.530 volt

Explanation:

We have given peak to peak voltage of ac wave = 1.5 volt

Peak to peak voltage of ac wave is equal to 2 times of peak voltage

So 2v_{peak}=1.5volt

v_{peak}=\frac{1.5}{2}=0.75volt

Frequency of ac wave is given f = 3 kHz

So angular frequency \omega =2\pi f = 2×3.14×3000 = 18840 rad/sec

So expression of equation will be v=v_msin\omega t=0.75sin(18840t) ( As phase difference is 0 )

Now we have to find the rms value of voltage

So rms voltage will be equal to v_{rms}=\frac{v_{peak}}{\sqrt{2}}=\frac{0.75}{1.414}=0.530volt

4 0
3 years ago
Lora (of mass 43.6 kg) is an expert skier. She starts at 3.6 m/s at the top of the lynx run, which is 67 m above the bottom. Wha
Likurg_2 [28]

Explanation:

As per the law of conservation of energy, the final mechanical energy of Lora is equal to its initial mechanical energy. So, when Lora is at the bottom of ski run then her potential energy will change into kinetic energy.

Hence,   E_{initial} = \frac{mv_{i}^{2}}{2} + mgh


              E_{final} = \frac{mv_{f}^{2}}{2}

Now, final kinetic energy that will be at the bottom of the ski run is as follows.

Let,          E_{k} = E_{final}

            E_{intial} = E_{final}

          E_{k} = \frac{mv_{i}^{2}}{2} + mgh


                   = \frac{(43.6 \times (3.6)^{2}}{2} + (43.6 \times 9.81 \times 67)

                   = 282.53 + 28656.97

                  = 28939.502 J

Thus, we can conclude that her final kinetic energy at the bottom of the ski run is 28939.502 J.

3 0
3 years ago
A car is traveling at a speed of 45 km/h into town. It takes the car 2 hours to get there. How far has the car traveled?
hjlf

Answer:

90 km

Explanation:

45 km per hr

2 hrs

45 x 2 = 90

90 km/2 hrs

Hope this helps!

7 0
3 years ago
Read 2 more answers
In 2.5 S, a Car increases its speed from 20.0m/s to 25.0 m/s what is the acceleration of the car​
Dima020 [189]

Answer:

2 m/s

Explanation:

3 0
3 years ago
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