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Makovka662 [10]
3 years ago
7

Which of the following examples accurately describes an object that is accelerating?

Physics
1 answer:
NemiM [27]3 years ago
3 0
"Acceleration" doesn't mean "speeding up".
It means ANY change in speed OR direction of motion.

A). The race car is moving at 150 mph.  Speed isn't changing, and we don't
know anything about its direction.  No evidence of acceleration there.

B).  A sailboat moves west, then north. 
It changed direction.  During the time that it was sailing
on a curve or around a corner, it was accelerating.

C).  A train half way between New York and Houston.
We don't know anything about its speed OR direction right now.
No evidence of acceleration there.

D).  A book sitting motionless.
Its speed is zero.  We know for a fact that its speed and direction
are not changing. So there is definitely no acceleration here.
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Every action produces an equal and opposite reaction. When a rocket shoots fuel out one end, this propels the rocket forward
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The sound of frequency greater than 20,000 Hz is called ....
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state position nature and size of an image when an object placed at an distance equal to its focal length of rear view in vehicl
maksim [4K]

Answer:

The position nature and size of an image when an object placed at a distance equal to its focal length of rear view mirrors in vehicle will be

1) Position: Behind the mirror

2) Nature: Virtual

3) Size: Smaller than the object

Explanation:

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5 0
3 years ago
The following represents a mass attached to a spring oscillating in simple harmonic motion. X(t) = 4.0 cos(3.0t +0.10) units of
kolbaska11 [484]

Answer:

a) A = 4.0 m , b)   w = 3.0 rad / s , c)  f = 0.477 Hz , d) T = 20.94 s

Explanation:

The equation that describes the oscillatory motion is

          x = A cos (wt + fi)

In the exercise we are told that the expression is

          x = 4.0 cos (3.0 t + 0.10)

let's answer the different questions

a) the amplitude is

         A = 4.0 m

b) the frequency or angular velocity

         w = 3.0 rad / s

c) angular velocity and frequency are related

          w = 2π f

           f = w / 2π

           f = 3 / 2π

           f = 0.477 Hz

d) the period

frequency and period are related

           T = 1 / f

           T = 1 / 0.477

           T = 20.94 s

e) the phase constant

          Ф = 0.10 rad

f) velocity is defined by

          v = dx / dt

         

         v = - A w sin (wt + Ф)

speed is maximum when sine is + -1

         v = A w

          v = 4 3

          v = 12 m / s

g) the angular velocity is

          w² = k / m

          k = m w²

          k = 1.2 3²

          k = 10.8 N / m

h) the total energy of the oscillator is

          Em = ½ k A²

           Em = ½ 10.8 4²

          Em = 43.2 J

i) the potential energy is

           Ke = ½ k x²

for t = 0 x = 4 cos (0 + 0.1)

               x = 3.98 m

j) kinetic energy

           K = ½ m v²

for t = 00.1 ²

    v = A w sin 0.10

    v = 4 3 sin 0.10

    v = 1.98 m / s

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