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taurus [48]
3 years ago
13

In which situation will two objects, each traveling with a speed of 2 m/s, have

Physics
1 answer:
nignag [31]3 years ago
4 0

Answer:

C.

Explanation:

the relative motion will be greater when it is travelling in opposite ditection

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A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 24.0° below the horizontal. The negligent
anzhelika [568]

Answer:

The position is  P  =  47.4 \ m relative to the base of the ocean

Explanation:

From the question we are told that

    The angle made by the incline with the horizontal is \theta =  24.0 ^o

    The constant acceleration is a =  3.82 \ m/s^2

    The distance covered is d =  60.0 \ m

    The height of the cliff is h  =  50 .0 \ m

The velocity of the car is mathematically represented as

      v^2 = u^2 +  2ad

The initial velocity of the car is  u= 0

So

     v^2 =  2ad

substituting values

     v^2 = 2 *  3.82 * 60

    v =  21.4 \ m/s

The vertical component of this velocity is

    v_v  =  -v * sin(\theta )

substituting values

    v_v  = -21.4 * sin(24.0)

    v_v  = -8.7 \ m/s

The negative sign is because is moving in the negative direction of the y-axis

The horizontal  component of this velocity is

     v_h  =  v * cos (\theta)

    v_h  =  21.4 * cos (24.0)

    v_h  = 19.5 \ m/s

Now according to equation of motion we have

     h  =  v_v*t  - \frac{1}{2} *  g t^2

substituting  values

    50  =  -8.7 t  - \frac{1}{2} *  9.8 t^2

    4.9t^2  +8.7t -50 = 0

using quadratic equation we have that

  t_1 = 2.42\ s \ and\   t_2 =  -4.20\ s

given that time cannot be negative

      t = 2.42 \ s

The  car’s position relative to the base of the cliff when the car lands in the ocean is mathematically evaluate as

           P  =  v_h * t

substituting values

          P  =  19.5 *  2.43

         P  =  47.4 \ m

5 0
3 years ago
When an object moves, where does the energy come from?
Eddi Din [679]
Ans: Kinetic and potential energies are found in all objects. If an object is moving, it is said to have kinetic energy (KE). Potential energy (PE) is energy that is "stored" because of the position and/or arrangement of the object. The classic example of potential energy is to pick up a brick.
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3 years ago
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3 years ago
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A ball bearing is projected vertically upwards from the ground with a velocity of 15ms. Calculate the time taken by the ball to
cupoosta [38]

Answer:

t = 3 [s]

Explanation:

To solve this problem we must use the following equation of kinematics.

v_{f}=v_{o}-g*t

where:

Vf = final velocity [m/s]

Vo = initial velocity = 15 [m/s]

g = gravity acceleration = 10 [m/s²]

t = time [s]

Now replacing we have:

0 = 15 -10*t\\10*t=15\\t= 1.5[s]

Note: In the equation above the gravity acceleration is negative, because the movement of the ball bearing is pointing againts the gravity acceleration.

The time calculated is only when the ball bearing reaches the highest elevation, and it will take the same time for descending, therefore the total time is:

t = 1.5 + 1.5 = 3 [s]

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3 years ago
What role does voltage play in the formation or use of an electromagnet?
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