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3 years ago

Static electricity is the

Physics

2 answers:

guapka [62]3 years ago

4 0

Unlike charges attracting each other

Galina-37 [17]3 years ago

4 0

A. Unlike charges attracting eachother

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(1 point) A gun has a muzzle speed of 90 meters per second. What angle of elevation θ, where 0≤θ≤π4, should be used to hit an ob

Likurg_2 [28]

Answer:

0.122 radians

Explanation:

Given that the muzzle speed is, $u=90m/s$

And the distance of the object is, $s=200 m$

And acceleration due to gravity is $g=9.8 m/s^{2}$

Therefore negative acceleration due to gravity for upward motion.

Now,

The x component of velocity will be, $u_{x}=ucos\theta$

The y component of velocity will be, $u_{y}=usin\theta$

And the horizontal displacement is given. Now horizontal displacement is,

$s=u_{x}\times t$

Here, $u_{x}$ is horizontal velocity and t is time.

Substitute all the values in above equation, we get

$s=ucos\theta\times t\\200=90cos\theta\times t\\t=\dfrac{200}{90cos\theta}\\t=\dfrac{20}{9cos\theta}$

Now, in y direction we can calculate displacement and in y direction displacement is zero.

$s_{y}=u_{y}t+\frac{1}{2}at^{2}$

Substitute all the variables.

$0=usin\theta t+\frac{1}{2}at^{2}\\0=90sin\theta (\frac{20}{9cos\theta})+\frac{1}{2}(-9.8 m/s^{2})\times (\frac{20}{9cos\theta})^{2} \\200tan\theta=4.9\times \frac{400}{81}\times \frac{1}{cos^{2}\theta}\\200sin\theta=\frac{24.1975}{cos\theta}\\ 2sin\theta cos\theta=0.241975\\sin2\theta=0.241975\\2\theta=sin^{-1}(0.241975)\\ \theta=0.122 radians$

Therefore the required angle of elevation is 0.122 radians.

8 0

4 years ago

A 0.50-kg toy is attached to the end of a 1.0-m very light string. The toy is whirled in a horizontal circular path on a frictio

Deffense [45]

Answer:

26.5 m/s

Explanation:

The tension in the string provides the centripetal force that keeps the toy in circular motion. So we can write:

$T=m\frac{v^2}{r}$

where:

T is the tension in the spring

m = 0.50 kg is the mass of the toy

r = 1.0 m is the radius of the circle (the length of the string)

v is the speed of the toy

The maximum tension in the string is

T = 350 N

If we substitute this value into the equation, we find the maximum speed that the mass can have before the string breaks:

$v=\sqrt{\frac{Tr}{m}}=\sqrt{\frac{(350)(1.0)}{0.50}}=26.5 m/s$

3 0

3 years ago

What is the wavelength in air of red light from a helium neon laser?

Elza [17]

Answer:

632.8 nm is the wavelength (in air) of red light from a helium neon laser.

4 0

2 years ago

The meaning of LIFE!

shtirl [24]

Meaning of life ....
condition that distinguishes animals and plants from inorganic matter, including the capacity for growth, reproduction, functional activity, and continual change preceding death.

5 0

3 years ago

A student initially 10.0 m East of his school walks 17.5 m West. The magnitude of the student's displacement, relative to the sc

Fantom [35]

Answer:

1. 7.5 m

2. towards west side

explanation:

I hope it will help you

3 0

3 years ago