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givi [52]
3 years ago
9

Gregory is visiting his grandmother, who lives 200 km from his house. While traveling there, Gregory had an average speed of 100

km/h. Which of the following is true about Gregory's trip?
O
A
Gregory must have maintained a constant velocity of 100 km/h.
C
B
Gregory must have maintained a constant speed of 100 km/h.
Gregory must have stopped sometime during his trip.
Gregory must have completed the trip in 2 hours.
Physics
2 answers:
labwork [276]3 years ago
5 0

Answer:

Gregory must have stopped sometime during his trip.

Explanation:

He must have stopped because he would have run out of gasoline.

yaroslaw [1]3 years ago
5 0
The answer I’ll be the last one
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A rock is dropped from the edge of a cliff into a pool of water. Assume free-fall acceleration is 10 m/s per second, and air res
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Answer:

20 m

Explanation:

From the equation of motion,

S = ut+1/2gt²................................. Equation 1

Where S = Height, u = initial velocity, t = time, g = acceleration due to gravity.

Note: Because the rocked is being dropped from a height, acceleration due to gravity is positive (g), and initial velocity (u) is negative

Given: t = 2.0 s, g = 10 m/s², u = 0 m/s (dropped from height)

Substituting into equation 1

S = 0(2) + 1/2(10)(2)²

S = 5(4)

S = 20 m

Hence the height of the the cliff above the pool is 20 m

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3 years ago
Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the ch
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Answer:

C. The superposition principle

Explanation:

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7 0
2 years ago
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A stone is thrown into a well and the splash is heard after 3s. (speed of sound : 340m/s) . 1.) What time did the stone take to
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1.)3s
2.)6s
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3 years ago
As you look at the side of the wheel, you can see it spinning clockwise. What are the directions of the angular velocity, and an
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Answer:

The direction of angular velocity and angular momentum are perpendicular to the plane of rotation. Using the right hand rule, the direction of both angular velocity and angular momentum is defined as the direction in which the thumb of your right hand points when you curl your fingers in the direction of rotation.

Explanation:

5 0
2 years ago
Monochromatic light falls on two very narrow slits 0.048 mm apart. Successive fringes on a screen 6.50 m away are 8.5 cm apart n
vfiekz [6]

Answer:

The wavelength is  \lambda  = 6.28 *10^{-7}=628 nm

The frequency is  f  =  4.78 Hz

Explanation:

From the question we are told that  

      The slit distance is d  =  0.048 \ mm  =  4.8 *0^{-5}\ m

       The distance from the screen is  D  =  6.50 \ m

       The distance between fringes is  Y  =  8.5 \ cm  = 0.085 \ m

Generally the distance between the fringes for a two slit interference is  mathematically represented as

           Y  =  \frac{\lambda  *  D}{d}

=>       \lambda  =  \frac{Y  * d  }{D}

substituting values      

           \lambda  =  \frac{0.085   * 4.8*10^{-5}  }{6.50 }

           \lambda  = 6.27 *10^{-7}=628 nm

Generally the frequency of the light is mathematically represented as

          f  =  \frac{c}{\lambda }

where  c is  the speed of light with  values  

         c =  3.0 *10^{8} \ m/s

substituting values  

      f  =  \frac{3.0*10^8}{6.28 *10^{-7}}

      f  =  4.78 Hz

3 0
2 years ago
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