PLEASE HELP THIS IS TIMED!

A spring with a spring constant of 4 N/m is stretched by Sarah's dog until extended by 2 m. How much elastic potential energy is

azamat

Hi there!

Recall the equation for spring potential energy:

$PE = \frac{1}{2}kx^2$

k = Spring constant (N/m)

x = extension of spring from equilibrium (m)

PE = Potential Energy (J)

Plug in the given values:

$PE = \frac{1}{2}(4)(2^2) = \boxed{8 J}$

8 0

2 years ago

On February 15, 2013, a superbolide meteor (brighter than the Sun) entered Earth’s atmosphere over Chelyabinsk, Russia, and expl

topjm [15]

Explanation:

A.

Using the wave equation:

v = d/t

Where,

v = velocity

d = distance

= 23.5 km

= 23500 m

t = time

= 2m 30s = 150 s

v = 23500/150

= 156.7 m/s

B.

From the calculated value above, it can be seen that the velocity of the heat blast is >>> than the velocity of sound above sea level.

3 0

4 years ago

Can I have some help

Arte-miy333 [17]

F I’m not sure if I’m right but I think the answer is F

8 0

3 years ago

A 47.4 kg student runs down the sidewalk and jumps with a horizontal speed of 42 m/s onto a stationary skateboard

Tpy6a [65]

Answer:

3 kg

Explanation:

Momentum before = momentum after

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

After jumping on the skateboard, the student and the skateboard have the same velocity, so v₁ = v₂.

m₁u₁ + m₂u₂ = (m₁ + m₂) v

(47.4 kg) (4.2 m/s) + m (0 m/s) = (47.4 kg + m) (3.95 m/s)

m = 3 kg

8 0

4 years ago

Photons of infrared radiation with wavelengths longer than those of visible light will have what kind of energy compared to that

densk [106]

Answer:

Infrared photons carry lower radiation energy than the visible light.

Explanation:

Each photon carries an energy that is directly proportional to its frequency, being this proportionality constant the Planck's constant h.
So, we can write the energy of a single photon as follows:

$E = h*\nu (1)$

Since there exists an inverse relationship between wavelength and frequency, and infrared radiation has longer wavelengths, this means that its frequency is lower than the one of the visible light.
So, an infrared photon carries less energy that one of the visible light.

6 0

3 years ago