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Ivan
2 years ago
9

If your car tachometer says your engine is moving at 1200 RPM, then what is it's angular velocity in Rad/sec?

Physics
1 answer:
Ostrovityanka [42]2 years ago
3 0

Answer:

125.66 R/s

Explanation:

First    1200  r / min = 20 r/sec

20 r/s  *  2pi Radians / r = 40 pi Radians / sec = 125.66 R/s

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RUDIKE [14]

Answer:

a) 2

b) 9

c) 5

d) 14

e) 4

f) 5

Explanation:

6 0
3 years ago
Jose is batting for the home team when he hits a foul ball that rises straight up over home plate. A fan in the stands notices t
andreyandreev [35.5K]

Answer:

<h3><em>28.01m/s.</em></h3>

Explanation:

Given maximum height reached by the ball as H = 40 metres

Since the ball rises straight up when hit by a ball, then the angle of launch will be perpendicular to the ground and that is 90°.

To determine the upward speed of the ball in meters per second after it got struck by the bat, we will use the formula for calculating the maximum height according to projectile motion;

Maximum Height H = \frac{u^2sin^2\theta}{2g} where;

u is the speed of the ball

\theta is the angle of launch

g is the acceleration due to gravity = 9.81m/s²

Substituting the given parameters into the formula;

40 = \frac{u^2sin^2(90)}{2(9.81)}\\ \\40 = \frac{u^2}{2(9.81)}\\ \\40 = \frac{u^2}{19.62} \\cross\ multiply\\\\u^2 = 40*19.62\\u^2 = 784.8\\u = \sqrt{784.8}\\ u = 28.01 m/s

<em>Hence the upward speed of the ball in meters per second after it got struck by the bat is 28.01m/s.</em>

5 0
3 years ago
The line spectrum of lithium has a red line at 670.8 nm. Calculate the energy of a photon with this wavelength.
Vadim26 [7]
First of all, we can calculate the frequency of the photon, which is related to the wavelength by the following equation:
f= \frac{c}{\lambda}
where c is the speed of light and \lambda=670.8 nm=670.8 \cdot 10^{-9} m is the photon wavelength. Substituting into the formula, we find the frequency
f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{670.8 \cdot 10^{-9} m}=4.47 \cdot 10^{14} Hz

Now we can find the energy of the photon with the following equation:
E=hf
where h is the Planck constant. Substituting numbers, we find
E=hf=(6.6 \cdot 10^{-34}Js)(4.47 \cdot 10^{14} Hz)=2.95 \cdot 10^{-19} J
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3 years ago
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weqwewe [10]
The momentum does not change because he is going the same speed just a different way.
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3 years ago
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A gram is the basic metric unit for measuring which of the following?
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Gram is used for measuring weight
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