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3 years ago

If f(x) = x2 - 3x + 1 and f(2 a) = 2f(a) then a is equal to

Physics

1 answer:

loris [4]3 years ago

5 0

For these question, it has two separate equations: 2f(a) and f(2a) .

For f(2a) equations its x=2a, so you must substitute 2a into the f(x) equation

For 2f(a), it means the two time of f(a) equation with x=a, so you substitute a inti f(x) equation first, then you multiply it by 2.

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If any problem involving circular motion, which way does the acceleration vector point ?

KIM [24]

Answer:

The acceleration vector always points towards the centre of the motion. This is referred to as centripetal acceleration. It accounts for the centripetal force that tends to pull the object in circular motion towards the centre of motion.

Consider the diagram below;

it illustrates a body in circular motion along the black circle, with the acceleration vector a shown by the orange arrow pointing towards the centre of motion and the velocity vector v shown by the green arrow pointing tangentially away from the circumference.

4 0

3 years ago

There is a girl pushing on a large stone sphere. The sphere has a mass of 8200 kgand a radius of 90 cm and floats with nearly ze

svetlana [45]

Answer:

35.1688 seconds

Explanation:

M = Mass of sphere = 8200 kg

R = Radius of sphere = 90 cm

F = Force = 30 N

Moment of inertia is given by

$I=\dfrac{2}{5}MR^2\\\Rightarrow I=\dfrac{2}{5}\times 8200\times 0.9^2\\\Rightarrow I=2656.8\ kgm^2$

Torque is given by

$\tau=I\alpha\\\Rightarrow FR=I\alpha\\\Rightarrow \alpha=\dfrac{FR}{I}\\\Rightarrow \alpha=\dfrac{30\times 0.9}{2656.8}\\\Rightarrow \alpha=0.01016\ rad/s^2$

For one rotation

$\theta=\omega_it+\dfrac{1}{2}\alpha t^2\\\Rightarrow 2\pi=0\times t+\dfrac{1}{2}\times 0.01016\times t^2\\\Rightarrow t=\sqrt{\dfrac{2\pi2}{0.01016}}\\\Rightarrow t=35.1688\ s$

The time taken to rotate the sphere from rest is 35.1688 seconds

3 0

3 years ago

3. A 64 lb weight stretches a spring 4 ft in equilibrium. The weight is initially displaced 6 inches above equilibrium and given

Damm [24]

Answer:

Explanation:

the solution is given in the attached pictures

6 0

3 years ago

The unit of electric current is the _____. A) volt B) ohm C) ampere D) faraday

professor190 [17]

the unit of electric current is the ampere, often shortened to amp

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3 years ago

Read 2 more answers

How does increasing energy affect the amplitude of a wave?

Crazy boy [7]

Answer:

The amount of energy carried by a wave is related to the amplitude of the wave

Explanation:

A high energy wave is characterized by a high amplitude; a low energy wave is characterized by a low amplitude. The energy imparted to a pulse will only affect the amplitude of that pulse.

Hope this helped!!!

5 0

3 years ago

If f(x) = x2 - 3x + 1 and f(2 a) = 2f(a) then a is equal to​

If f(x) = x2 - 3x + 1 and f(2 a) = 2f(a) then a is equal to