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2 years ago

Hannah drove 360 mi in 5.2 hours. What was her average speed?

1 answer:

5 0

Her average speed would be 69.2 miles per hour

Explanation:
When you take the number of miles and divide it by the number of hours you get 69.2 (when rounded)
That is how fast she went per hour

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At a particular instant, a proton at the origin has velocity < 5e4, -2e4, 0> m/s. You need to calculate the magnetic field

vesna_86 [32]

Answer:

$9.7\times 10^{-5} T$

Explanation:

Velocity = $5\times 10^4i-2\times 10^4j$

r= $0.03i+0.05j$

r= $\mid r\mid=\sqrt{(0.03)^2+(0.05)^2}=0.058$

v= $\mid V\mid=\sqrt{(5\times 10^4)^2+(-2\times 10^{4})^2}=5.39\times 10^{2}$

We know that

$B=\frac{mv}{qr}$

Where q= $1.6\times 10^{-19} C$

Mass of proton= $1.67\times 10^{-27} kg$

Using the formula

$B=\frac{1.67\times 10^{-27}\times 5.39\times 10^2}{1.6\times 10^{-19}\times 0.058}$

$B=9.7\times 10^{-5} T$

3 0

3 years ago

A laser pulse of duration 25 ms has a total energy of 1.4 J. The wavelength of this radiation is

SpyIntel [72]

Answer:

n = 4 x 10¹⁸ photons

Explanation:

First, we will calculate the energy of one photon in the radiation:

$E = \frac{hc}{\lambda}\\\\$

where,

E = Energy of one photon = ?

h = Plank's Constant = 6.625 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength of radiation = 567 nm = 5.67 x 10⁻⁷ m

Therefore,

$E = \frac{(6.625\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{5.67\ x\ 10^{-7}\ m}$

E = 3.505 x 10⁻¹⁹ J

Now, the number of photons to make up the total energy can be calculated as follows:

$Total\ Energy = nE\\1.4\ J = n(3.505\ x\ 10^{-19}\ J)\\n = \frac{1.4\ J}{3.505\ x\ 10^{-19}\ J}\\$

n = 4 x 10¹⁸ photons

8 0

3 years ago

Which of earth sphere have the most mass

DochEvi [55]

The Geosphere which is 99.94% of earths mass

6 0

2 years ago

If 5000Pa a pressure is exerted on an object with the contact area 0.04m^2. Calculate the mass of an object

Whitepunk [10]

Pressure = 5000 Pa
Contact Area = 0.04 m^2
Acceleration due to gravity = 9.8 m/s^2
Let the force be F.
We know, Force = Pressure × Contact Area
Therefore, Force = 5000 Pa × 0.04 m/s^2
or, Force = 200 N
We know, force = mass × acceleration
Therefore, mass = force ÷ acceleration
or, mass = 200 N ÷ 9.8 m/s^2 = 20.4 Kg

Answer:

20.4 Kg

Hope you could understand.

If you have any query, feel free to ask.

6 0

1 year ago

Set the ball and the barrier about two feet apart on the table. Grasp both ends of the ruler. Push the ball using the center of

almond37 [142]

Answer:

its rolling

Explanation:

5 0

2 years ago

Read 2 more answers