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3 years ago

1 6. Which of the following astronomical units is c/osest to the distance of the earth to the sun?

Physics

1 answer:

Ganezh [65]3 years ago

6 0

Answer:

astronomical unit

Explanation:

https://en.wikipedia.org/wiki/Astronomical_unit

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A spring, when compressed 0.20 m from the equilibrium position, stores 24 J. What is the value of the spring constant

Delvig [45]

Given that:

spring compressed ( x) = 0.2 m

Work (W) = 24 J

determine , spring constant (x)=?

We know hat ,

Work (W) = (1/2). k.x²

24 = 1/2 ( k × 0.2²)

48 = k × 0.2²

3 0

3 years ago

Ellus

Lesechka [4]

Answer:

W'=125.44 N

Explanation:

The weight of a person on the surface of Earth is 784 N

Weight is given by :

W = mg

m is mass of the person and g is acceleration due to gravity on the surface of Earth (10 m/s²)

$m=\dfrac{W}{g}\\\\m=\dfrac{784}{10}\\\\m=78.4\ kg$

The acceleration due to gravity on the surface of Moon, g' = 1.6 m/s²

Weight of the person on the moon is :

W'=mg'

$W'=78.4\ kg\times 1.6\ m/s^2\\\\W'=125.44\ N$

Hence, the person would weigh 125.44 N on the Moon.

6 0

3 years ago

In an arcade game a 0.117 kg disk is shot across a frictionless horizontal surface by compressing it against a spring and releas

Illusion [34]

Find the speed with which the disk slides across the surface

Answer:

$\boxed{2.85 m/s}$

Explanation:

The Potential energy of spring is transformed to kinetic energy hence

$0.5kx^{2}=0.5mv^{2}\\kx^{2}=mv^{2}\\v=\sqrt{\frac {kx^{2}}{m}}$

Here k is the spring constant, x is the extension of spring, v is the velocity of disk and m is the mass of the disk.

Substituting 0.117 Kg for m, 194 N/m for k and 0.07 m for x then

$v=\sqrt{\frac {194\times 0.07^{2}}{0.117}}=2.850401081 m/s\approx \boxed{2.85 m/s}$

3 0

3 years ago

The _____(height or width) of a sound wave determines its _____(loudness or pitch).

postnew [5]

<h2>Answer: The <u>height</u> of a sound wave determines its <u>loudness</u> </h2>

Sound waves are longitudinal mechanical waves, that is, they depend on a medium to propagate.

Among the characteristics of a sound wave, it is the amplitude, that is the degree of movement of the molecules of the medium in which the wave propagates.

Depending on how high this amplitude is, the sound will be louder.

5 0

3 years ago

Read 2 more answers

As your skateboard coasts uphill, your speed changes from 3 m/s to 1 m/s in

vlada-n [284]

Answer:

$a=-0.33\ m/s^2$

Explanation:

<u>Accelerated Motion</u>

The acceleration of a moving body is defined as the relation of change of speed (or velocity in vector form) with the time taken. The formula is given by

$\displaystyle a=\frac{\Delta v}{t}$

Or, equivalently

$\displaystyle a=\frac{v_f-v_o}{t}$

Where vf and vo are the final and initial speeds respectively. The problem gives us these values: v0 = 3 m/s, vf = 1 m/s, t = 3 seconds. Computing a

$\displaystyle a=\frac{1-3}{3}=-0.33\ m/s^2$

The negative sing of a indicates there is deceleration or decreasing speed

7 0

3 years ago