Physics, 11.11.2019 20:31 MartinTDL

A230 g, 50.0-cm-diameter turntable rotates on frictionless bearings at 63.0 rpm. a 21.0 g block sits at the center of the turntable. a compressed spring shoots the block radically outward along a frictionless groove in the surface of the turntable.
what is the turntable's rotation angular velocity when the block reaches the outer edge?

Answers: 3

Show answers

Answers

Answer from: Epicgible8136

ω₂ = 5.578 rads⁻¹

Explanation:

The moment of inertia of,

turn table = $\frac{1}{2}mr^{2}$

block = $mr^{2}$

By the law of conservation of angular momentum, as no external torque acts on system the total angular momentum of the system when block sits at center and when block at the outer edge must be same.

Also to find ω, ω = 2πf where f is rpm

= 2π×63/60 = 6.597

I₁ω₁ = I₂ω₂

( $\frac{1}{2}0.23(0.5)^{2}$ + $0.021(0)^{2}$ )×6.597 = ( $\frac{1}{2}0.23(0.5)^{2}$ + $0.021(0.5)^{2}$ )×ω₂

ω₂ = 5.578 rads⁻¹

Answer from: Quest

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Another question on Physics

Physics, 22.06.2019 02:30

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Answers: 2

Answer

Physics, 22.06.2019 10:10

What is the angular momentum of the bar about the axle?

Answers: 3

Answer

Physics, 22.06.2019 19:50

Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j

Answers: 3

Answer

Physics, 23.06.2019 11:00

I’m the absence of a net force, a moving object will

Answers: 1

Answer

You know the right answer?

A230 g, 50.0-cm-diameter turntable rotates on frictionless bearings at 63.0 rpm. a 21.0 g block sits...

Questions