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marshall27 [118]
2 years ago
9

. The average human walks at a speed of 5 km per hour. If your PE teacher asks you to walk for 30 minutes in

Physics
1 answer:
lisabon 2012 [21]2 years ago
7 0

Answer: 2.5 km

Explanation:

5/2 = 2.5 km

60/2 = 30 mins

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I would say that this is the first law of thermodynamics.
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Freezing involves the ______________ of latent heat and a change is state from the ______________ phase to the solid phase.
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7 0
3 years ago
If Karen rode her bicycle 5 km to school in 30 minutes, what was her average speed? Give your answers in km/h.
Doss [256]

Answer:

10 km/h

Explanation:

Before calculating the average speed, we need to convert the time taken for the trip from minutes to hours. Since 1 hour cointains 60 minutes, we have:

1 h: 60 min = t : 30 min\\t=\frac{1 h \cdot 30 min}{60 min}=0.5 h

Karen's average speed is given by:

v=\frac{d}{t}

where

d = 5 km is the distance covered

t = 0.5 h is the time taken for the trip

Substituting into the equation, we find

v=\frac{5 km}{0.5 h}=10 km/h

5 0
3 years ago
What is the proper hand position when driving straight ahead
vekshin1

NHTSA (National Highway Traffic Safety Administration) now recommends the technique known as 9 and 3. Place your left hand on the left portion of the steering wheel in a location approximate to where the nine would be if the wheel was a clock. Your right hand should be placed on the right portion of the wheel where the three would be located.

7 0
3 years ago
(a) Calculate the magnitude of the gravitational force exerted on a 497-kg satellite that is a distance of 1.92 earth radii from
Setler [38]

Answer:

a)  1321.45 N

b)  1321.45 N

c)  2.66 m/s^2

d) 2.21*10^-22 m/s^2

Explanation:

Hello!

First of all, we need to remember the gravitational law:

F = G \frac{m_1 m_2}{r^2}

Were

   G = 6.67428*10^-11 N(m/kg)^2

   m1 and m2 are the masses of the objects

   r is the distance between the objects.

In the present case

m1 = earth's mass =  5.9742*10^24 kg

m2 = 497 kg

r = 1.92 earth radii = 1.92 * (6378140 m) = 1.2246*10^7 m

Replacing all these values on the gravitational law, we get:

F = 1321.45 N

a)  and  b)

Both bodies will feel a force with the same magnitude 1321.45 N but directed in opposite directions.

The acceleration can be calculated dividing the force by the mass of the object

c)

a_satellite = F/m_satellite = ( 1321.45 N)/(497 kg)

a_satellite = 2.66 m/s^2

d)

a_earth = F/earth's mass = (1321.45 N)/( 5.9742*10^24 kg)

a_earth = 2.21*10^-22 m/s^2

8 0
2 years ago
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