PHYSICS HIGH SCHOOL

A racecar is traveling in uniform circular motion around a racetrack. What happens to the centripetal acceleration of the car if the speed is doubled and the radius of the circle remains constant?

Answers

Answer 1
Answer:

Answer:

centripetal acceleration becomes 4 times

Explanation:

Given that a car is in the uniform circular motion on a circular track initially and then its speed is doubled.

Now as we know the equation for centripetal acceleration in a circular motion is given as:

a_c=(v^2)/(r)

where:

a_c= initial centipetal acceleration

v = initial speed of the car

r = radius of the track (remains constant)

When the speed is doubled:

a_c'=((2v)^2)/(r)

a_c'=(4v^2)/(r)

a_c'=4* (v^2)/(r)

a_c'=4\ a_c

i.e. centripetal acceleration becomes 4 times in the later case.
Answer 2
Answer:

Answer:

4 TIMES

Explanation:

As centripetal acceleration has formula a =v^2/r. as r is constant so a is directly proportional to square of speed so square of 2 is 4 hence 4 times

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A failure of the red-sensitive nerves in the eye to respond to light properly causes A. astigmatism.
B. farsightedness.
C. chromatic aberration.
D. color blindness.

Answers

D. colour blindness

"red-sensitive" just means that the nerves are able to see red light

D. Color blindness is your correct answer

a car requires 1x10^8J of energy to drive 30km. calculate how many kilometers you could hypothetically drive using the energy contained in the rest mass of 100mg of fuel.

Answers

Ah hah !  I spy a question about  E = m c² .
OK, here we go.  Fossen your seat belt, mon,
it's going to be eh boompy rade !

E = energy equivalent of mass
m = the mass of the mass
c = the speed of light

              E  =  (m)  (c)²

                  = (100 mg) (3 x 10⁸ m/s)²

                 =  (1 x 10⁻⁴ kg) (9 x 10¹⁶ m²/s²)

                 =        9 x 10¹²  (kg-m²/s²)

                 =        9 x 10¹²  (kg-m/s²) (m)

                 =        9 x 10¹²  (newton) (m)

                 =        9 x 10¹²  joules .

The car can go 30 km on  10⁸ J of energy.

How far can it go on  9 x 10¹² J ?

                (9 x 10¹² J) x (30 km / 10⁸J)

             =  (9 x 10⁴) x (30 km)  =  2,700,000 km

             =          roughly    7.3 times the distance to the moon.

What is the volume of a rectangular object with L = 4.00 cm W = 2.00 cm H = 0.50 cm?

Answers

simply plug in these numbers into the Volume formula of a rectangle:
1) V=LWH
2)V=(4.00)(2.00)(0.50)
3)V=4cm^3
V=LWH
L=4
W=2
H=0.5
V=(4)(2)(0.5)
V=4cm^3

4 cubic centimeters

A solid geometric shape formed by a mineral is called

Answers

When a mineral is formed into a geomoetric shaped it is called a crystal

Answer:

Crystal.

Explanation:

What is the kinetic energy of a 30 kg falling object when the object reaches a velocity of 20 m/s?

Answers

Ek = 1/2mv^2 Ek = 1/2 * 30kg * 20^2 m/s Ek = 6000J Hope this Helps!

A scientific law is based on repeated inferences made over long periods of time.

Answers

A scientific law is based on repeated inferences made over long periods of time.
TRUE

Answer:

False

Explanation:
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