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viktelen [127]
3 years ago
13

What does a force acting on an object do to that object';s motion?

Physics
1 answer:
ch4aika [34]3 years ago
8 0
Accourding to newtons second law of motion:
Force = mass * acceleration
F = ma
a = F/m
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Acceleration is a measure of the change in the velocity of an object per unit time true or false
Ksju [112]

This is true. Hope I helped!

3 0
3 years ago
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Unless indicated otherwise, assume the speed of sound in air to be v = 344 m/s. A stationary police car emits a sound of frequen
bixtya [17]

Answer:

a) The velocity of the car is 7.02 m/s and the car is approaching to the police car as the frequency of the police car is increasing.

b) The frequency is 1404.08 Hz

Explanation:

If the police car is a stationary source, the frequency is:

f_{a} =(\frac{v+v_{c} }{v} )f_{s} (eq. 1)

fs = frequency of police car = 1200 Hz

fa = frequency of moving car as listener

v = speed of sound of air

vc = speed of moving car

If the police car is a stationary observer, the frequency is:

f_{L} =f_{a} (\frac{v}{v-v_{c} } )=(\frac{v+v_{c} }{v-v_{c} } )f_{s} (eq. 2)

Now,

fL = frequecy police car receives

fs = frequency police car as observer

a) The velocity of car is from eq. 2:

1250=1200(\frac{v+v_{c} }{v-v_{c} } )\\1250(v-v_{c} )=1200(v+v_{c} )\\v_{c} =\frac{50*344}{2450} =7.02m/s

b) Substitute eq. 1 in eq. 2:

f_{L} =(\frac{v+v_{p} }{v-v_{c} } )(\frac{v+v_{c} }{v-v_{p} } )f_{s} =(\frac{344+20}{344-7.02} )(\frac{344+7.02}{344-20} )*1200=1404.08Hz

7 0
4 years ago
The MRI (Magnetic Resonance Imaging) body scanners used in hospitals operate at a frequency of 400 MHz (M = 106 ). Calculate the
horrorfan [7]

Answer:

Energy, E=2.65\times 10^{-25}\ J

Explanation:

It is given that,

The MRI (Magnetic Resonance Imaging) body scanners used in hospitals operate at a frequency of 400 MHz,

\nu=400\ MHz=400\times 10^6\ Hz=4\times 10^8\ Hz

We need to find the energy for a photon having this frequency. The energy of a photon is given by :

E=h\nu

E=6.63\times 10^{-34}\ J-s\times 4\times 10^8\ Hz

E=2.65\times 10^{-25}\ J

So, the energy of the photon is 2.65\times 10^{-25}\ J. Hence, this is the required solution.

6 0
3 years ago
What are the three ways to accelerate?
Nookie1986 [14]

Answer:

There are three ways an object can accelerate: a change in velocity, a change in direction, or a change in both velocity and direction.

Explanation:

5 0
3 years ago
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Jacki evaluated the expression below. 2 cubed (3 minus 1) + 4 (8 minus 12) = 2 cubed (2) + 4 (4) = 8 (2) + 16 = 16 + 16 = 32. Wh
Naddika [18.5K]

Answer:

Her error was that she did not subtract 12 from 8 correctly

Explanation:

Jackie did 8-12 instead of 12-8

8 0
3 years ago
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