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Kobotan [32]
3 years ago
9

Explain why friction makes it harder to push a box filled with groceries than an empty box

Physics
1 answer:
kupik [55]3 years ago
5 0
It is harder to push a box with groceries in it because the mass is weighing the box down. Which makes it harder to push
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An ant climbs to the very end of the second hand on a wall-mounted clock at exactly 9:15:00. The second hand is 13.5 cm long. Wh
Mekhanik [1.2K]

Answer:

Explanation:

a) The second arm measures the minutes. The difference between 9:17:30 and 9:15:00 is 2 minutes 30 seconds. This means the second arm would have revolved 2.5 times.

The circumference = 2πr= 2π(13.5 cm) = 84.823 cm

Distance = 2.5 × 84.823 cm = 212 cm = 2.12 m

b) Displacement of an object is the shortest distance between the initial and final point. Since the second arm revolves 2 and half times, we use only the half times (a semicircle)

Displacement for semicircle = 2r = 2(13.5) = 27 cm

c) Average speed = distance / time

time = 2 minutes 30 seconds = 150 seconds

Average speed = 212 cm / 150 s = 1.41 cm/s

d) Average velocity = displacement / time = 27 cm / 150 s = 0.18 cm/s

e) number of revolutions = 100 m / circumference = 100 m / 0.848 m = 117.92

but 1 revolution = 1 minute

117.92 revolution = 117 minutes 55 seconds = 1 hour 57 minutes 55 seconds

Hence the time would be: 11:12:55

3 0
3 years ago
Only some shortwave radiation from the Sun reaches Earth’s surface. What is the leading cause of this radiation loss? Only some
anastassius [24]

Answer: Reflection by clouds

Explanation:

Only some shortwave radiation from the sun reaches the Earth's surface because solar radiation is being reflected by  thick clouds and thin clouds transmit the  solar radiation.

About 31 % of solar radiation is reflected by clouds. The tiny water particle scatters 20-90 % of incoming sunlight giving them a bright white appearance.

4 0
3 years ago
Sentences with the word food chain
rosijanka [135]
Animals have a food chain. (sorry for my bad English)
5 0
3 years ago
Elements are arranged in groups by similar atomic structure on the periodic table. This allows for an elements properties to be
DiKsa [7]

C

Atomic radius is the distance between the center of the nucleus to the outermost orbital shell of the atom. Assume the atom is like a football stadium and the nucleus of the atom is a ball placed at the center of the pitch. The atomic radius is from the center of the ball to the edge of the football stadium.

Explanation:

This atomic radius decreases from left to right of a periodic table because of increases in protons in the nucleus along the periodic table. This increased proton count has  a higher attractive force on the electron orbitals of the atom. This decreases the atomic radius

The atomic radius of atoms down a column of the periodic table increase because an extra orbital shell is added to the atoms with every period down the column.

Learn More:

brainly.com/question/1604565

brainly.com/question/13126562

#LearnWithBrainly

5 0
4 years ago
Read 2 more answers
How much energy must be added to a 2-kg piece of glass with a specific heat
MAXImum [283]

Answer:

51520J

Explanation:

The energy added to the piece of glass is also called heat needed to increase its temperature from 10°C to 50°C and it depends on the mass, specific heat capacity and the change in temperature.

Q=m.c.ΔT

Q=(2kg).(644J/(kg°C)).((50°C)-(10°C))

Q=51520J                    

3 0
4 years ago
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