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denis23 [38]
2 years ago
7

8TH GRADE SCIENCE PLEASE HELPPP

Physics
1 answer:
balu736 [363]2 years ago
6 0

Answer:

The two helicopters have the same kinetic energy, but a different GPE, or gravitational potential energy.

Explanation:

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(a) Find the frequency of revolution of an electron with an energy of 114 eV in a uniform magnetic field of magnitude 46.7 µT. (
stira [4]

Answer:

(a)  1.3 x 10^6 Hz

(b) 76.73 cm

Explanation:

(a)

the formula for the frequency is given by

f = B q / 2 π m

where, B be the strength of magnetic field, q be the charge on one electron, m is the mass of one electron.

B = 46.7 micro tesla = 46.7 x 10^-6 T

q = 1.6 x 10^-19 C

m = 9.1 x 10^-31 kg

f = (46.7 x 10^-6 x 1.6 x 10^-19) / (2 x 3.14 x 9.1 x 10^-31) = 1.3 x 10^6 Hz

(b) K = 114 eV = 114 x 1.6 x 10^-19 J = 182.4 x 10^-19 J

K = 1/2 mv^2

182.4 x 10^-19 = 0.5 x 9.1 x 10^-31 x v^2

v = 6.3 x 10^6 m/s

r = m v / B q

Where, r be the radius of circular path

r = (9.1 x 10^-31 x 6.3 x 10^6) / (46.7 x 10^-6 x 1.6 x 10^-19)

r = 0.7673 m = 76.73 cm  

5 0
3 years ago
How much work done if an object is moving to the right and a force of 75. 0n is applied at 125 degrees to the motion while the o
bogdanovich [222]

Answer:

-322.64 J

Explanation:

75 N  * cos 125     *    7.5   =  -322.64 J

4 0
2 years ago
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