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Makovka662 [10]
3 years ago
8

I'm having trouble understanding the equation for average speed. Can someone please explain to me because I have a test tomorrow

and I need to learn it ASAP thanks
Physics
1 answer:
serious [3.7K]3 years ago
7 0
Average speed = total distance covered divided by the total time
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Bowl of water A bowl full of water is sitting out in a pouring rainstorm. Its surface area is 500 cm2. The rain is coming straig
vova2212 [387]

Answer: 4.9 x 10-3 N

Explanation:

A = 500cm^2 = 5 x 10^-2 m^2

V = 5 m/s

R = 10^-3 g/cm^2.sec = 10^-2kg/m^2 . sec

Prain water = R / V = 10^-2 / 5 = 2 x 10-3 kg/m^3

For the stationary bowl,

dm/dt =pAv= RA

F= dp/dt = (dm/dt) v = RAv = 2.5 x 10^-3 N

Bowl moving upwards to speed u = 2 m/s

dm/dt = pA ( v + u) / v

F = dp/dt = (dm/dt)(v+u) = RA (v+u)^2 / v = 4.9 x 10^-3 N

5 0
3 years ago
Thirty beats are heard in one minute when two notes are played together. If the higher note has a frequency of 740 Hz, what is t
Tatiana [17]
30 beats/1min = 30 beats/60 sec = .5 beat/sec = 1/2 Hz
740 Hz - 1/2 Hz = 739.5 Hz

Answer - c. 739.5 Hz
6 0
3 years ago
A catapult with a spring constant of 10,000 N/m is used to launch a target from the deck of a ship. The spring is compressed a d
Mnenie [13.5K]

Answer:

(C) 40m/s

Explanation:

Given;

spring constant of the catapult, k = 10,000 N/m

compression of the spring, x = 0.5 m

mass of the launched object, m = 1.56 kg

Apply the principle of conservation of energy;

Elastic potential energy of the catapult = kinetic energy of the target launched.

¹/₂kx² = ¹/₂mv²

where;

v is the target's  velocity as it leaves the catapult

kx² = mv²

v² = kx² / m

v² = (10000 x 0.5²) / (1.56)

v² = 1602.56

v = √1602.56

v = 40.03 m/s

v ≅ 40 m/s

Therefore, the target's velocity as it leaves the spring is 40 m/s

6 0
3 years ago
NEED SOME HELP!!<br><br>How are electromagnetic spectrum or waves different from other waves?​
Sever21 [200]

Answer:

Electromagnetic spectrum is the arrangement of all kinds of radiation according to their frequency and wavelength. They don't require a material medium for their propagation.They are transverse waves that travel in a direction perpendicular to the direction of vibration.

8 0
3 years ago
In the picture below, the green spheres represent particles of solute that have been added to water. Bonds between the solute pa
frozen [14]

Answer:

As they absorb energy, they are broken.

Explanation

Solutes dissolve when they interact with water. This is because, the attraction of solute particles with each other weakens and become replaced by solute-solvent interaction. As the water surrounds the solute, the solute is now said to be hydrated.

Energy is required to break solute-solute bonds. This energy absorbed in breaking solute-solute bonds is compensated for by the energy liberated when solute particles are hydrated.

If energy required to break solute-solute interaction is less than the energy liberated when solute particles are hydrated, the substance will dissolve in water.

Hence, as a substance dissolve in water, energy is absorbed when solute-solute interactions are broken.

3 0
3 years ago
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