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notka56 [123]
3 years ago
10

Which object has a constant speed? a racecar starting a race a car traveling the speed limit a bicycle coming to a stop a ball f

alling off a table
Physics
2 answers:
alina1380 [7]3 years ago
5 0
The correct answer for this would be "A car traveling the speed limit" this is because the car is not accelerating, and all the other answers are wrong because the objects in those are accelerating <span />
k0ka [10]3 years ago
3 0

Answer: The correct answer is "a car traveling the speed limit".

Explanation:

In uniform motion, the speed is constant. Suppose, a car is travelling at constant speed. Here, the acceleration is zero. As there is no change in the rate of change of velocity.

In the given options,

"A race car starting a race": Here, the car will change its speed. The speed is not constant in this case.

"A car traveling the speed limit": Here, the car will not change its speed. The speed of the car is constant.

"A bicycle coming to a stop": The final speed of the bicycle is zero when it comes to a stop.  Here, the car will change its speed. The speed is not constant in this case.

"A ball falling off a table": Here, the car will change its speed. The speed is not constant in this case. The initial velocity is zero.

The correct option is "a car traveling the speed limit".

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Which statement is true about how early humans met their needs?
Black_prince [1.1K]

Answer:

they were hunter gatherers

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3 years ago
9. A car driver brakes gently. Her car slows down front --
sleet_krkn [62]

Answer:

9) This is a case of deceleration

10)-0.8 ms-2

b) acceleration is the change in velocity with time

11)

a) 100 ms-1

b) 100 seconds

12) 10ms-1

13) more information is needed to answer the question

14) - 0.4 ms^-2

15) 0.8 ms^-2

Explanation:

The deceleration is;

v-u/t

v= final velocity

u= initial velocity

t= time taken

20-60/50 =- 40/50= -0.8 ms-2

11)

Since it starts from rest, u=0 hence

v= u + at

v= 10 ×10

v= 100 ms-1

b)

v= u + at but u=0

1000 = 10 t

t= 1000/10

t= 100 seconds

12) since the sprinter must have started from rest, u= 0

v= u + at

v= 5 × 2

v= 10ms-1

14)

v- u/t

10 - 20/ 25

10/25

=- 0.4 ms^-2

15)

a=v-u/t

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7 0
3 years ago
The orbital radius of an electron in a hydrogen atom is 0.846 nm. What is its de Broglie wavelength?
kotykmax [81]

Answer:

The  value  is  \lambda   = 1.329 *10^{-9} \  m

Explanation:

From the question we are told that

  The  orbital radius is  r =  0.846nm =  0.846 *10^{-9} \ m

Generally the de Broglie wavelength is mathematically represented as

      \lambda  =  \frac{2 *  \pi  r}{4}

substituting values

     \lambda  =  \frac{ 2 * 3.142  *  0.846 *10^{-9}}{4}

    \lambda   = 1.329 *10^{-9} \  m

6 0
3 years ago
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