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Elis [28]
4 years ago
10

Which statement describes the motion of a mass on a spring? It exhibits constant velocity motion. It exhibits simple harmonic mo

tion. It exhibits circular motion. It exhibits only upward motion.
Physics
1 answer:
barxatty [35]4 years ago
6 0
The statement that describes the motion of a mass on a spring would be: <span>It exhibits constant velocity motion
The motion in mass of the spring will follow the basic Hooke's law which stated that the stress/force of an elastic object like spring will be proportional to the stress applied to it.</span>
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A fireman of 80 kg slides down a pole.When he reaches the bottom, 4.2 m below his starting point, his speed is 2.2 m/s . By how
levacccp [35]

Answer:

3099 J

Explanation:

The increase in thermal energy corresponds to the mechanical energy lost in the process.

The mechanical energy is given by the sum of gravitational potential energy and kinetic energy of the fireman:

E=K+U

At the top of the pole, the fireman has no kinetic energy, so all his mechanical energy is just potential energy:

E=U=mgh=(80 kg)(9.8 m/s^2)(4.2 m)=3293 J

When the fireman reaches the bottom, he has no gravitational potential energy, so his mechanical energy is just given by his kinetic energy:

E=K=\frac{1}{2}mv^2=\frac{1}{2}(80 kg)(2.2 m/s)^2=194 J

So, the loss in mechanical energy was

\Delta E=3293 J-194 J=3099 J

and this corresponds to the increase in thermal energy.

7 0
3 years ago
A pilot wishes to fly on a course of 290° with an air speed of 300 knots when the wind blows from 224° at 18 knots. Find the dri
kow [346]
The answer is 3.18 degrees
4 0
4 years ago
Read 2 more answers
A thin layer of oil of refractive index 1.22 is spread on the surface of water (n = 1.33), If the thickness of the oil is 275 nm
ANTONII [103]

Answer:

6.71×10⁻⁷ m

Explanation:

Using thin film constructive interference formula as:

<u>2×n×t = m×λ</u>

Where,

n is the refractive index of the refracted surface

t is the thickness of the surface

λ is the wavelength

If m =1

Then,

2×n×t = λ

Given that refractive index pf the oil is 1.22

Thickness of the oil = 275 nm

Also, 1 nm = 10⁻⁹ m

Thickness = 275×10⁻⁹ m

So,

Wavelength is :

<u>λ= 2×n×t = 2× 1.22 × 275×10⁻⁹ m = 6.71×10⁻⁷ m</u>

8 0
4 years ago
Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The cooler one has a surface t
Blizzard [7]

Answer:

Explanation:

Let hotter star has surface area of A . The cooler star would have surface area 9 times that of hotter star ie 9A , because its radius is 3 times hot star. Let temperature of hot star be T ₁.

Total radiant energy is same for both the star

Using Stefan's formula of black body radiation,

For cold star E = 9A x σ T⁴

For hot star E = A x σ T₁⁴

A x σ T₁⁴ = 9A x σ T⁴

T₁⁴ = (√3)⁴T⁴

T₁ = √3T .

b )

Let the peak intensity wavelength be λ₁ and λ₂ for cold and hot star .

As per wein's law

for cold star , λ₁ T = b ( constant )

for hot star  λ₂ √3T = b

dividing

λ₁ T / λ₂ √3T = 1

λ₂  / λ₁ =  1 / √3

7 0
4 years ago
It is generally a good idea to gain an understanding of the "size" of units. Consider the objects listed and calculate the magni
Alex

Answer:

Explanation:

The standard unit of momentum Is kgm/s

And momentum is the product of mass and velocity

Then,

Momentum = mass × velocity

P = mv

Where

m is mass in kg

v is velocity in m/s

Now,

Given that,

M = 31.8mg

1mg = 10^-3g

So, m = 31.8 × 10^-3g

Also, 1000g = 1kg → 1g = 10^-3 kg

So,

m = 31.8 × 10^-3 × 10^-3kg

m = 31.8 × 10^-6 kg

v = 2.53mi/hr

1mile = 1609.34 m

1 hour = 3600seconds

Then,

v = 2.53 × 1609.34m/ 3600s

v = 1.13 m/s

So, momentum is given as

P = mv

P = 31.8 × 10^-6 × 1.13

P = 3.597 × 10^-5 kgm/s

5 0
3 years ago
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