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Harlamova29_29 [7]

3 years ago

9

a snooker ball travels 4 meters, diagonally across the table it travels at a speed of 5m/s. calculate how long the ball is trave

lling for

1 answer:

Korvikt [17]3 years ago

6 0

Answer:

4 secs

Explanation:

I am right trust me

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What is the wavelength of a radio wave with a frequency of 2.00 x 10^4 Hz? (hint: what is the speed of all electromagnetic radia

patriot [66]

Answer: Option B

The wavelength for a radio wave with a frequency of 2 × 10⁴ Hz is

1.5 × 10⁴ m.

Explanation:

Wavelength is the measure of distance between two successive crests or troughs in a standing wave. Also wavelength can be measured as the ratio of velocity of light to frequency. It is like this because wavelength is inversely proportional to the frequency.

$Wavelength =\frac{c}{frequency}$

As c = 3 × 10⁸ m/s and the frequency is 2 × 10⁴ Hz, then the wavelength will be

$Wavelength =\frac{3*10^{8} }{2*10^{4} } =1.5*10^{4} m$

So, the wavelength for a radio wave with a frequency of 2 × 10⁴ Hz is

1.5 × 10⁴ m.

5 0

3 years ago

The box of a well-known breakfast cereal states that one ounce of the cereal contains 113 Calories (1 food Calorie = 4186 J). If

mafiozo [28]

Answer:

$m=454.73 kg$

Explanation:

To convert the energy of the cereal to know the weight:

$m*g*h=Q'$

$Cal=0.0179*113 Cal=2.0227Cal$

$Q'=2.0227Cal*\frac{4186J}{1Cal}$

$m*g*h=8467.02J$

$m*g=\frac{Q'}{h}=\frac{8467.02J}{1.90m}$

$m*g=4456.33 N$

Supuse the gravity as a g=9.8m/s^2

$m=\frac{4456.33N}{9.8m/s^2}$

$m=454.73 kg$

3 0

3 years ago

Read 2 more answers

A cylindrical specimen of some metal alloy 11.2 mm (0.4409 in.) in diameter is stressed elastically in tension. A force of 14100

MrRissso [65]

Answer:

μ = 0.436

Explanation:

Given:

Change in diameter, ΔD = 7 × 10⁻³ mm

Original diameter, D = 11.2 mm = 11.2 × 10⁻³ m

Applied force, P = 14100 N

Cross-section area of the specimen, A = $\frac{\pi}{4}D^2$ = $\frac{\pi}{4}(11.2\times 10^{-3})^2$

Now,

elongation due to tensile force is given as:

$\delta = \frac{PL}{AE}$

or

$\frac{\delta}{L} = \frac{P}{AE}$

on substituting the values, we get

$\frac{\delta}{L} = \frac{14100}{\frac{\pi}{4}(11.2\times 10^{-3})^2\times100\times 10^9}$

or

$\frac{\delta}{L} = 0.00143=\epsilon_x$

where,

$\epsilon_x$ is the strain in the direction of force

Now,

$\epsilon_z=\frac{\Delta D}{D}=\frac{7\times 10^{-3}}{11.2}=0.000625$

now, the poisson ratio, μ is given as:

$\mu=\frac{\epsilon_z}{\epsilon_x}$

on substituting the values we get,

$\mu=\frac{0.000625}{0.00143}=0.436$

7 0

3 years ago

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If an object of mass 70kg falls from a height of 500 m, what is the maximum velocity of the object?

Umnica [9.8K]

Answer:

H = 1/2 * g * t^2 since initial velocity is zero

v = g * t where v is the final velocity

t = v / g

H = 1/2 g * v^2 / g^2 = 1/2 v^2 / g

v = (2 * H * g)^1.2

v = (2 * 500 * 9.8)^1/2 = 99 m/s

Check: t = v / g = 99 / 9.8 = 10.1 sec

H = 1/2 * 9.8 * 10.1^2 = 500 m

7 0

3 years ago

The potential energy of a 25 kg bicycle resting at the top of a 3 m high hill is _______ J

frozen [14]

The potential energy:
E p = m · g · h
m = 25 kg, g = 9.81 m/s², h = 3 m
E p = 25 kg · 9.81 m/s² · 3 m = 735.75 J

5 0

3 years ago

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