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pashok25 [27]
3 years ago
7

A car travels across Texas m miles at the rate of t miles per hour. How many hours does the trip take??

Physics
1 answer:
Marianna [84]3 years ago
8 0

Answer: The trip takes \frac{m}{t}hours

Explanation:

Velocity V is the variation of the position of a body (distance traveled d) with time T:

V=\frac{d}{T}

In this case, the car travels a distance d=m miles at a velocity V=t \frac{miles}{hour} and we need to find the time it takes the trip.

Isolating  T:

T=\frac{d}{V}=\frac{m miles}{t \frac{miles}{hour}}

Finally:

T=\frac{m}{t}hours

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If a roller coaster car had 40,000 J of gravitational potential energy when at rest on the top of a hill how much kinetic energy
Inessa [10]

Answer:

K.E = 30,000 J

Explanation:

Given,

The potential energy of the roller coaster car, P.E = 40000 J

The kinetic energy at height h/4, K.E = ?

According to the law of conservation of energy, the total energy of the system is conserved.

At height 'h', the total energy is,

                                    P.E = mgh

                                     K.E = 0

At height 'h/4', the total energy is

                                     P.E + K.E = mgh

                                     P.E = mgh/4

                                     K.E = 1/2 mv²

Therefore,

                                   mgh/4 + 1/2 mv² = mgh

                                    gh/4 + v²/2 = gh

Hence,

                                      v² = 3gh/2

Substituting in the K.E equation

                               K.E = 1/2 mv²

                                      = 1/2 m (3gh/2)

                                       = 3/4 mgh

                                        = 3/4 x 40000

                                         = 30000 J

Hence, the K.E of the roller coaster car is, K.E = 30000 J

6 0
3 years ago
If the speed of light in a substance is 2.26 x 10^8 m/s, what is the index of refraction of that substance?
vladimir1956 [14]

Answer:

1.33

Explanation:

speed of light in vacuum, c = 3 x 10^8 m/s

speed of light in medium, v = 2.26 x 10^8 m/s

The refractive index of the medium is given by

μ = speed of light in vacuum / speed of light in medium

μ = (3 x 10^8) / (2.26 x 10^8)

μ = 1.33

4 0
3 years ago
What is the area of a circle of a radius 4.1×10^4 cm
dmitriy555 [2]

Answer:

128805.2988 cm squared or 128000 to 3 significant figures.

Explanation:

Area of a circle : pi times radius squared or r^{2} \pi

pi times 4.1×10^4 cm = 41000 pi or 128805.2988

4 0
3 years ago
The altitude of a hang glider is increasing at a rate of 6.75 m/s. At the same time, the shadow of the glider moves along the gr
Rufina [12.5K]

Answer:

16.45 m/s

Explanation:

Let y be the vertical distance and x be the horizontal distance

We are given that

The altitude of hang glider increasing at the rate=v_y=\frac{dy}{dt}==6.75m/s

The shadow of the glider moves along the ground at speed=v_x=\frac{dx}{dt}=15m/s

We have to find the magnitude of glider's velocity.

We know that

Magnitude of velocity=v=\sqrt{v^2_x+v^2_y}

Substitute the values

v=\sqrt{(15)^2+(6.75)^2}

v=\sqrt{225+45.5625}

v=16.45m/s

Hence, the magnitude of glider's velocity=16.45 m/s

4 0
3 years ago
A girl on a motorbike passes by at a speed of 15 m/ sec. her mass is 40 kg. what is her kinetic energy
garik1379 [7]
KE = 1/2 * m* v^2
 = 1/2 * 40 *  225
 = 4500 J

hope it helped


8 0
3 years ago
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