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2 years ago

A bullet having the mass of 110g is fired. If it's velocity is 50m/s, calculate the kinetic energy

2 answers:

7 0

$\text{Kinetic energy,}\\\\E_k = \dfrac 12 mv^2\\\\~~~~~=\dfrac 12 \cdot 110 \times 10^{-3} \cdot 50^2\\\\~~~~~=137.5~ \text{J}$

natulia [17]2 years ago

4 0

Answer: 137.5 Joules

Explanation:

The SI units for kinetic energy is Joules, the SI units for mass is kilograms, and the SI units for velocity is meters per second. We are given the mass in grams, so we must convert it to kilograms. There are 1,000 grams in 1 kilogram:

$110g*\frac{1kg}{1000g} =0.11kg$

Kinetic energy is the energy the system has due to its motion. It is defined to be:

$KE=\frac{1}{2} mv^2$

Plug everything in:

$KE=\frac{1}{2} (0.11kg)(50m/s)^2$

$KE=137.5J$

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Answer:

$\mu_s = 0.62$

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Explanation:

First, we will calculate the acceleration using the kinematics equations. We will denote the direction along the incline as x-direction.

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$F = mg\sin(\theta) - \mu_k mg\cos(\theta)\\1.7m = mg\sin(31.8) - \mu_k mg\cos(31.8)\\1.7 = (9.8)\sin(\theta) - mu_k(9.8)\cos(\theta)\\mu_k = 0.415$

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$mg\sin(31.8) = \mu_s mg\cos(31.8)\\\mu_s = tan(31.8) = 0.62$

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Answer: it is C

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Explanation:

Thermistors (temperature-sensitive, or thermal, resistors) are used as temperature-measuring devices and in electrical circuits to compensate for temperature variations of other components. They are also used to measure radio-frequency power and radiant power, such as infrared and visible light.

To measure the intensity of the electromagnetic wave after knowing the frequency, we can calculate it by using fast fourier transformations (FFT).

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A bullet having the mass of 110g is fired. If it's velocity is 50m/s, calculate the kinetic energy​

A bullet having the mass of 110g is fired. If it's velocity is 50m/s, calculate the kinetic energy