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2 years ago

what causes you to get warm if you stand bear a fire ? A . Transmission B . Radiation C . Convection D . Conduction

Physics

2 answers:

stira [4]2 years ago

5 0

Answer:

Explaination:

Radiation refers to the emission of energy in rays or waves. Heat moves through space as energy waves.

enot [183]2 years ago

3 0

Answer:

Radiation

Explanation:

Heat can be transferred though thin air

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An RV is traveling 60 km/h along a highway at night. A boy sitting near the driver of the RV turns a flashlight on and shines it

Varvara68 [4.7K]

Answer:

300,000,000 and the second question is the same.

Explanation:

Edge

5 0

3 years ago

How many x-ray photons per second are created by an x-ray tube that produces a flux of x rays having a power of 1.00 W

ArbitrLikvidat [17]

Complete question:

How many x-ray photons per second are created by an x-ray tube that produces a flux of x rays having a power of 1.00 W. Assume the average energy per photon in 78.0 keV.

Answer:

The number of x-ray photons per second created by the x-ray tube is 8.01 x 10¹³ photons/sec

Explanation:

Given;

power of the flux produced, P = 1 W = 1 J/s

energy per photon, E = 78 keV

Convert the energy per photon to J

E = 78 x 10³ x 1.6 x 10⁻¹⁹ = 1.248 x 10⁻¹⁴ J / photon

let the number of photons = n

n(1.248 x 10⁻¹⁴ J / photon) = 1 J/s

$n = \frac{1 \ J/s}{1.248 \times 10^{-14}\ J/photon } = 8.01 \times 10^{13} \ photons/s$

Therefore, the number of x-ray photons per second created by the x-ray tube is 8.01 x 10¹³ photons/sec

8 0

2 years ago

You are kicking your soccer ball back and forth on a soccer field. You kick the ball forward for 10 m. You turn completely aroun

Evgesh-ka [11]

Answer:

1.) Total distance = 70 m

2.) Total displacement = +30m

Explanation:

Distance is a scaler quantity. That is, we will be concerned about its magnitude only and not direction.

Total distance = 10 + 20 + 40 = 70 m

While displacement is a vector quantity. We will consider both the magnitude and its direction.

Forward direction will be positive while backward direction will be negative

Total displacement = +10 - 20 + 40

Total displacement = +30 m

7 0

3 years ago

Can someone solve this problem and explain to me how you got it

likoan [24]

Answer:

Explanation:

Coulomb's law states that the force of attraction or repulsion between any two charges is proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between the charges

⇒ $F\alpha\frac{q1*q2}{r^{2}}$