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3 years ago

2 rocks of different masses roll down a hill at the same speed which rock has more kinetic energy small one or big one ???

Physics

2 answers:

gregori [183]3 years ago

7 0

The big rock will be exhibiting more kinetic energy.

Explanation:

The kinetic energy is calculated for an object with the formula of ½ mv2. Here m is the mass of the object and v is the velocity or speed of the object.

As it is known that the speed of two rocks with different masses are same so the kinetic energy will be completely depending on the mass of the object.

So the rock with higher mass will be having more kinetic energy compared to the smaller rock as its mass will be less.

So the bigger stone will be exhibiting more kinetic energy than the small one.

Sophie [7]3 years ago

5 0

Kinetic energy depends on the mass and the speed of a moving object.

If the speeds are equal, then the rick with more mass has more kinetic energy.

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8 0

3 years ago

A uniform solid sphere rolls down an incline. A) What must be the incline angle (deg) if the linear acceleration of the center o

Nonamiya [84]

Answer:

a) θ = 12.12°

b) equal to 0.21g

Explanation:

Solution:-

Declare variables:

- The mass of solid sphere, m

- The inclination angle, θ

- The linear acceleration a down the slope of the solid sphere is a = 0.21g

Where, g: The gravitational acceleration constant.

- The component of weight of solid sphere directed down the slope is given by:

Ws = m*g*sin ( θ )

- Apply Newton's second law of motion down the slope, state:

F_net = m*a

- The only net force acting on the solid sphere is the Weight. So, the equation of motion in the coordinate axis ( down the slope ).

Ws = m*a

m*g*sin ( θ ) = m*0.21*g

- Solve for inclination angle ( θ ):

sin ( θ ) = 0.21

θ = arcsin ( 0.21 )

θ = 12.12°

- If a friction-less block of mass ( m ) moves down the same slope then block has weight component down the slope as:

Wb = m*g*sin ( θ )

- Apply Newton's second law of motion down the slope, state:

F_net = m*a

- The only net force acting on the solid sphere is the Weight. So, the equation of motion in the coordinate axis ( down the slope ).

Ws = m*a

m*g*sin ( θ ) = m*a

- Solve for linear acceleration ( a ):

g*sin ( θ ) = a

a = sin ( 12.12 ) * g

a = 0.21g

Answer: The acceleration is independent of mass and only depends on the inclination angle θ.

7 0

4 years ago

How much does 1 liter of water weigh

Zinaida [17]

Weight = (mass) x (gravity)

On Earth ...

Weight = (1 kg) x (9.8 m/s^2)

Weight = 9.8 Newtons

8 0

3 years ago

An auto race takes place on a circular track. A car completes one lap in a time of 18.0 s, with an average tangential speed of 4

eduard

Answer:

(A) 0.3488 rad/sec

(B) 124.246 m

Explanation:

We have given car completes one revolution in 18 sec'

So time period T= 18 sec

Tangential speed v = 43.4 m/sec

(A) Angular velocity is given by $\omega =\frac{2\pi }{T}=\frac{2\times 3.14}{18}=0.3488rad/sec$

(B) Tangential velocity is given v = 43.4 m /sec

We know that $v=\omega r$

$r=\frac{v}{\omega }=\frac{43.4}{0.3488}=124.426m$

4 0

3 years ago

To see her full heiht, a child that is 1 meter tall needs a mirror that is at least A) 033 m tall. 6) 050 m tall C) 075 m tall.

svlad2 [7]

Answer:

0.50 m tall

Explanation:

To see the full height of the child the height of the mirror should be half of the height of the child

As it id given that the height of the child is 1 meter so the height of the mirror is $=\frac{height\ of\ child}{2}=\frac{1}{2}=0.5m$

As it is a rule that to see the full any object the height of the mirror should be half of the height of the object

7 0

3 years ago