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Gennadij [26K]
3 years ago
8

If a car increases in velocity from +5 m/s to +15 m/s in three seconds, what us it's acceleration?

Physics
1 answer:
erma4kov [3.2K]3 years ago
8 0

Answer:

the answer is B

Explanation:

the formula for acceleration is change in velocity ÷ time taken so 10 m/s divided by 3s is 3.3 m/s2

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Un autobús viaja en una carretera a una velocidad de 70 km/h y acelera durante 30 segundos hasta llegar a su límite de velocidad
nalin [4]

Answer:

a = 30 km / h²

Explanation:

Dado que

Velocidad inicial, u = 70 km / h

Velocidad final, v = 95 km / h

Tiempo, t = 30 s = 0.1 h

Lo sabemos

v = u + a t

a = aceleración

Ahora poniendo los valores en la ecuación anterior

95 = 70 + a \ times 0.1


a = \ dfrac {95-70} {0.1} = 30 \ km / h ^ 2


Por lo tanto, la aceleración será

a = 30 km / h²

4 0
4 years ago
Gave and example of each of exothermic and Dictyledor​
TEA [102]

Answer:

Making of an ice cube. Making ice cube is a process of liquid changing its state to solid. ...

Snow formation in clouds. ...

Burning of a candle. ...

Rusting of iron. ...

Burning of sugar. ...

Formation of ion pairs. ...

Reaction of Strong acid and Water. ...

Water and calcium chloride.

Explanation:

8 0
3 years ago
A series of pulses of amplitude 0.25 m are sent down a string that is attached to a post at one end. The pulses are reflected at
Klio2033 [76]

Answer:

0m

Explanation:

since the string is rigidly attached to the post, the reflected and incident pulses are of the same amplitude but different polarities. At the point where the two pulses meet, the amplitude will be the addition of that of the incident and the reflected pulses. i.e Amplitude= 0.25 + -0.25=0m

4 0
4 years ago
A layer cake profile of different soil types is exposed when we dig into the earth. Geologists reason that these layers were lai
Len [333]

The layer cake profile of different soil types having older soil type at the bottom of the layer is proved by the law of superposition.

Explanation:

The literal meaning of the word superposition means arranging one over the other. So the first generation soil or rocks will be deposited first on the mantle followed by the coming generation of soils and rocks. Due to different kinds of disasters like tides, earthquake, soil erosion etc., the new soil or rocks coming from any other region will get deposited on the surface of the old soil layer just like a layer cake format.

So the presence of older soil in the bottom most part of the mantle and the youngest soil or rock in the topmost surface of Earth is proved by the law of superposition.

3 0
4 years ago
An archer pulls her bow string back 0.40 m by exerting a force that increases uniformly from zero to 230 N. (a) What is the equi
Naya [18.7K]

Hi there!

Using Hooke's Law:
F = kx

F = Force (N)
k = Spring constant (N/m)
x = displacement from equilibrium

We are given the force and displacement, so solve for 'k':
k = \frac{F}{x}\\
\\
k = \frac{230}{0.4} = \boxed{575 N/m}

6 0
3 years ago
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