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4 years ago

Which energy transformation occurs when a firecracker explodes

1 answer:

7 0

before the firecracker explodes it has potential energy which is transformed into kinetic energy when it explodes.

<em>hope this helps!</em>

<em>have a great day :)</em>

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A thin uniform cylindrical turntable of radius 2.3 m and mass 22 kg rotates in a horizontal plane with an initial angular speed

Svetllana [295]

Answer:

ω = 5.5 rad/s

Explanation:

Assuming no external torques present during the instant that the clump of clay is dropped on the turntable, total angular momentum must be conserved.
The angular momentum of a rotating rigid body, can be expressed as follows:

$L = I * \omega (1)$

where I = moment of inertia regarding the axis of rotation, and ω =

angular speed of the rotating body.

Since the angular momentum must keep constant, this means that it must be satisfied the following equality:

$L_{o} = L_{f} (2)$

where L₀ = I₀ * ω₀, Lf = If * ωf.

I₀ is the moment of inertia of a solid disk rotating around an axis

passing through its center, as follows:

$I_{o} =\frac{1}{2} * m* r^{2} = \frac{1}{2} * 22 kg*(2.3m)^{2} = 58.2 kgm2 (3)$

If, is the moment of inertia after dropping the clump of clay, which adds

its own moment of inertia as a point mass, as follows:

$I_{f} =\frac{1}{2} * m* r^{2} + m_{cl} * r_{cl}^{2} =58.2 kgm2 + (8.7kg)*(1.5m)^{2} \\ = 58.2 kgm + 19.6 kgm2 = 77.8 kgm2 (4)$

Replacing I₀, If and ω₀ in (2), we can solve for ωf, as follows:

$\omega_{f} = \frac{I_{o} *\omega_{o} }{I_{f}} = \frac{58.2kgm2*7.3rad/s}{77.8kgm2} = 5.5 rad/s (5)$

4 0

3 years ago

I am so confused please help

dexar [7]

The Answer is B as it is the only reasonable answer that favors Nuclear Energy.

3 0

4 years ago

A bullet with a mass ????b=13.5mb=13.5 g is fired into a block of wood at velocity ????b=253vb=253 m/s. The block is attached to

Lorico [155]

Answer:

450 grams

Explanation:

Given:

mass of the bullet, m = 13.5 g = 0.0135 kg

velocity of the bullet, v = 253 m/s

spring constant of the spring, k = 205 N/m

Compression of the spring, x = 35.0 cm = 0.35 m

Now, the kinetic energy of the moving system (bullet + board) will tend to move the spring

thus,

let velocity of the system, V

now, applying the concept of conservation of momentum, we have

mv = (M + m)V

where,

M is the mass of the block

thus,

V = mv/(M + m)

now,

the kinetic energy of the system = (1/2)(M + m)V²

the kinetic energy of the system = (1/2)(M + m)(mv/(m + M))²

Energy gained by the spring = (1/2)kx²

now,

equating both the energies, we get

(1/2)(M + m)(mv/(m + M))² = (1/2)kx²

(mv)²/(m + M) = kx²

on substituting the values, we get

(0.0135 × 253)²/(0.0135 + M) = 205 × (0.35)²

11.66/(0.0135 + M) = 25.1125

M = 0.450 kg = 450 grams

8 0

4 years ago

_____ provides heat to flowing magma that forms convection cells.

Zina [86]

Answer:

Explanation:

Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

3 0

4 years ago

Read 2 more answers

Calculate the density of a solid of mass 20kg if it occupies a volume of 4m³

choli [55]

Answer:

Density=Mass/Volume

=20/4 kg/m^3

=5 kg/m^3

4 0

3 years ago