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3 years ago

A 350kg motorcycle is moving at 20m/s. It then speeds up to 30m/s. How much work did the engine do to accelerate?

Physics

1 answer:

xeze [42]3 years ago

8 0

Answer:

momentum= mass× velocity

=350kg (30-20) m/s

=3500kgm/s

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An 11,000-watt radio station transmits at 880 kHz. Calculate the energy of a single photon at the transmitted frequency.

prisoha [69]

The energy of a single photon at the transmitted frequency is $\bold{5834.4 \times 10^{-31} \mathrm{J}}$

Answer: Option b

Solution:

Energy of photon is given as $E=\frac{h c}{\lambda}$

Where c is the velocity of Light $\left(3 \times 10^{8} m / s\right)$

h is planck's constant $\left(6.63 \times 10^{-34}\right)$

λ is the wavelength of photon

Energy of photon can be rewritten as $E=h \times f$

Where f is the frequency of photon

Frequency of photon is obtained by dividing velocity of light by wavelength of photon.

$f=\frac{c}{\lambda}$

$E=6.63 \times 10^{-34} \times 880 \times 10^{3}=5834.4 \times 10^{-31} \mathrm{J}$

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3 years ago

You have a perfectly circular apple pie with a radius of 15cm. You cut the pie into 12 approximately equal slices. What is the a

Sedaia [141]

Answer:

7.85 cm

30 degree

Explanation:

As we know that that the angular displacement in one turn is 360 degree.

As there are 12 parts which are equally divided so the angle turn by each part is

= 360 / 12 = 30 degree

Thus, the angular displacement of each slice is 30 degree.

Radius of pie = 15 cm

Circumference of pie = 2 x 3.14 x 15 = 94.2 cm

Arc length for complete 360 degree = 94.2 cm

Arc length for 30 degree turn = 94.2 x 30 / 360 = 7.85 cm

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3 years ago

If the speed of an object doubles its kinetic energy does what

Helga [31]

If the speed of the object becomes double, its kinetic energy changes to four times the initial kinetic energy. Hope it help!

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Threepointchargeshaveequalmagnitudesandarelocatedonthesameline. The separation d between A and B is the same as the separation b

Molodets [167]

Answer: B, C, A

Explanation:

Electrostatic force F = kq²/d²

Let the force on A be Fa, and B be Fb and C be Fc.

For Fa, distance between A and B is d, and distance between A and C is 2d

For Fb, distance between B and A is d, and distance between B and C is d

For Fc, distance between C and B is d, and distance between C and A is 2d

Also, the charge of each charge affects the sign of the force.

Check the attachment below

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A helicopter propeller applies an upward force of 2800 N. The force of gravity on the helicopter is 2000 N. Another person of we

Alexeev081 [22]

Answer:

Explanation:

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