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Misha Larkins [42]
3 years ago
13

A racing car can complete a 900 m long lap in 15 s. What is the speed of the car?

Physics
2 answers:
GREYUIT [131]3 years ago
8 0

Answer:

The speed of the car is 60 m/s.

Explanation:

It is given that,

Distance covered by the racing car, d = 900 m

Time taken by the car, t = 15 s

Let v is the speed of the car. The speed of any object is equal to the distance covered divided by total time taken as :

v=\dfrac{d}{t}

v=\dfrac{900\ m}{15\ s}

v = 60 m/s

So, the speed of the car is 60 m/s. Hence, this is the required solution.

Gemiola [76]3 years ago
4 0

60 is the speed of the car

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3 years ago
Which statement is true for light passing into a medium that is less optically dense than the first medium through which it pass
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Answer:

The correct option is;

The index of refraction of the second medium is lower

Explanation:

The index of refraction of a material indicates the magnitude of the optical density of a material. The index of refraction or the refractive index, n, are indices (ratio) of the speed of light through an optically dense medium relative to the speed of light through a vacuum.

The definition of the refractive index is the number of times light travelling through a medium would be slower than light travelling through vacuum

Therefore, the index of refraction of a second medium that is less optically dense than a first medium from which light originates and travels through it would be lower than the index of refraction of the first medium

5 0
2 years ago
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The two spheres pictured above have equal densities and are subject only to their mutual gravitational attraction. Which of the
kiruha [24]

Answer:

Gravitational force

Explanation:

If two spheres have equal densities and they are subject only to their mutual gravitational attraction. We need to say that the quantities that must have the same magnitude for both spheres. So, the correct option is (E) i.e. gravitational force.

It is because of Newton's third law of motion. It states that the force due to object 1 to object 2 is same as force due to object 2 to object 1. The two forces act in opposite direction.  

Hence, the correct option is (E) "Gravitational force".                        

8 0
3 years ago
When an electron falls from a higher to a lower energy level in an atom, the photon released has a wavelength of 121.6 nm. What
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Answer:

\Delta E=1.64*10^{-18}J

Explanation:

The energy difference between the energy levels involved in the transition of the electron is directly proportional to the frequency of the emitted photon:

\Delta E=h\nu(1)

Where h is the Planck constant. The photon's frequency is inversely proportional to its wavelegth:

\nu=\frac{c}{\lambda}(2)

Here c is the speed of light. Replacing (2) in (1):

\Delta E=\frac{hc}{\lambda}\\\Delta E=\frac{(6.63*10^{-34}J\cdot s)(3*10^8\frac{m}{s})}{121.6*10^{-9}m}\\\Delta E=1.64*10^{-18}J

6 0
3 years ago
A bullet of 5 gm is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 m/s,
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Answer:

-450 m/s

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