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3 years ago

A physicist drops astone off the top of cliff over looking a lake. She hears the splash 4 second after releasing the stone?

Physics

1 answer:

Angelina_Jolie [31]3 years ago

6 0

Answer:

Height of cliff(h) = 80 meter (Approx)

Explanation:

Given:

Time taken t = 4 sec

Gravitational acceleration = 10 m/s (Approx)

Find:

Height of cliff(h)

Computation:

h = ut + 1/2(g)(t)²

Height of cliff(h) = (0)(4) + 1/2(10)(4)²

Height of cliff(h) = 80 meter (Approx)

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A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A

Sonja [21]

Answer:

I = 70.86 kg.m²

Explanation:

given,

radius of the cylinder = 0.33 m

Tangential force = 210 N

angular acceleration = 0.978 rad/s²

we know,

$\tau = F \times r$

and

$\tau =I \times \alpha$

computing both the torque equation together

$F \times r = I \times \alpha$

$I = \dfrac{F\times r}{\alpha}$

$I = \dfrac{210\times 0.33}{0.978}$

I = 70.86 kg.m²

Moment of inertia of the wheel is equal to 70.86 Kg.m²

3 0

4 years ago

Two balloons are charged with an identical quantity and type of charge: -4 nc They are held apart at a separation distance of 70

blagie [28]

Answer:

29.4 uN

Explanation:

The electric force between two charges can be calculated using Coulomb's Law. According to this law the force between two point charges is given as:

$F=k\frac{q_{1} q_{2} }{r^{2}}$

where k is a proportionality constant known as the Coulomb's law constant. Its value is $9 \times 10^{9}$ Nm²/C²

r = distance between charges = 70 cm = 0.7 m

q1 = q2 = 4nC = $4 \times 10^{-9}$ C

The negative sign indicates that the charges are negative. In the formula we will only use the magnitude of the charges.

Using these values in the formula, we get:

$F=9 \times 10^{9} \times \frac{4 \times 10^{-9} \times 4 \times 10^{-9}}{0.7^{2}}\\\\ F=2.94\times10^{-7} N\\\\ F=29.4 \times 10^{-6} N\\\\ F=29.4 \mu N$

Therefore, the magnitude of repulsive force between the given charges will be 29.4 uN

8 0

4 years ago

What does personal mission statement?

KonstantinChe [14]

Answer:

<em>A personal mission statement defines who you are as a person (or as a team member where you work) and identifies your purpose, whether that's in the office or simply in life. </em>

Explanation:

<em>It explains how you aim to pursue that purpose, and why it matters so much to you.</em>

3 0

2 years ago

When an electron enters a region of uniform magnetic field (B=0.19T), with its

kobusy [5.1K]

The radius of the track in the circular motion is 0.164 mm.

<h3>Magnetic force of the of charge</h3>

The magnetic force of the charge is calculated as follows;

F = qvB

<h3>Centripetal force of the charge</h3>

The centripetal force experienced by the charge is calculated as follows;

$F = \frac{mv^2}{r}$

<h3>The magnetic force is equal to the centripetal force</h3>

$qvB = \frac{mv^2}{r} \\\\qB = \frac{mv}{r} \\\\r = \frac{mv}{qB} \\\\$

<h3>The radius of the track</h3>

The radius of the track is calculated as follows;

$r = \frac{9.1 \times 10^{-31} \times 5.5 \times 10^6}{1.6 \times 10^{-19} \times 0.19} \\\\r = 1.64 \times 10^{-4} \ m\\\\r = 0.164 \times 10^{-3} \ m\\\\r = 0.164 \ mm$