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3 years ago

1. A material with a(n) _____

Physics

1 answer:

asambeis [7]3 years ago

6 0

Answer:

a material with a large specific heat can absorb a great deal of thermal energy without a great change in temperature.

Explanation:

The specific heat capacity of an object is the amount of energy needed to raise the temperature of 1 kg of mass of a substance by $1^{\circ}C$ .

Mathematically, it is given by:

$C=\frac{Q}{m\Delta T}$

where

Q is the amount of energy supplied

m is the mass of the substance

$\Delta T$ is the change in temperature of the substance

The equation can be rewritten as:

$\Delta T=\frac{Q}{mC}$

Therefore, we see that the increase in temperature of a substance is inversely proportional to its specific heat capacity.

Therefore, a material with a large specific heat can absorb a great deal of thermal energy without a great change in temperature.

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A 6 cm long spring extends to 9 cm when a 1 kg load is suspended from it. What would be its length if a 2 kg load were suspended

Ganezh [65]

The answer is D that is the right question

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3 years ago

An aluminum wire having a cross-sectional area equal to 3.90 10-6 m2 carries a current of 6.00 A. The density of aluminum is 2.7

stich3 [128]

Answer:

Vd = 1.597 ×10⁻⁴ m/s

Explanation:

Given: A = 3.90×10⁻⁶ m², I = 6.00 A, ρ = 2.70 g/cm³

To find:

Drift Velocity Vd=?

Solution:

the formula is Vd = I/nqA (n is the number of charge per unit volume)

n = No. of electron in a mole ( Avogadro's No.) / Volume

Volume = Molar mass / density ( molar mass of Al =27 g)

V = 27 g / 2.70 g/cm³ = 10 cm³ = 1 × 10 ⁻⁵ m³

n= (6.02 × 10 ²³) / (1 × 10 ⁻⁵ m³)

n= 6.02 × 10 ²⁸

Now

Vd = (6A) / ( 6.02 × 10 ²⁸ × 1.6 × 10⁻¹⁹ C × 3.9×10⁻⁶ m²)

Vd = 1.597 ×10⁻⁴ m/s

6 0

3 years ago

Explain a lever and a pivot in a full sentence

worty [1.4K]

Answer:

The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot.

IF HELPED MARK AS BRAINLIEST

4 0

3 years ago

Some workers are trying to lift up to the third floor of a building, which is 8.0 meters above the ground. The piano is 500 kg w

irina1246 [14]

Answer:

Weight = 4900 N

Explanation:

Given:

Mass of the piano is, $m=500\ kg$

Acceleration due to gravity is, $g=9.8\ m/s^2$

Height to which the piano is raised is 8.0 m.

We are asked to determine the weight of the piano.

We know that, weight of a body is nothing but gravitational force acting on it by the center of Earth. It is equal to the product of mass and acceleration due to gravity.

Weight is independent of height til the height is very less than the radius of Earth. At very high altitudes which are comparable to the radius of Earth, the value of 'g' changes and hence the weight. But, here the height is very small and hence the value of 'g' equals 9.8 m/s² only.

Thus, weight of the piano is given as:

Weight = Mass $\times$ Acceleration due to gravity

Weight = $mg$

Weight = $(500\ kg)(9.8\ m/s^2)=4900\ N$

Weight is a force so, its unit is same as that of force and hence it is measured in Newtons.

Therefore, the weight of the piano is 4900 N.

8 0

3 years ago

The diameter of a spherical balloon that is being filled with air is increasing at the rate of 3 inches more than the time, t. W

Sever21 [200]

The description of the problem is a bit ambiguous as "<span>increasing at the rate of </span>3 inches more than the time" can be interpreted in many ways. Assuming the increase rate is the (3+t) per second and as it expands for 3 seconds, then the diameter of the sphere would be:
d= (3 + t)*t
d= 3t + t^2= 18

r= 1/2 d
r= 1/2*18= 9

volume= 4/3 * pi * r^3
volume= 4/3 * pi * 9^3
volume= 4/3 * pi * 729= 972 pi cubic inches

7 0

4 years ago

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