a girl pulls a wagon by applying a force to it .what other force can you infer acts on the wagon in opposit direction

Answers

Answer 1

Answer: Friction I believe, because the friction from the ground would pull against the wagon.

Answer 2

Answer: Friction because it pushes the wagon and it comes from the ground

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The weight of a person is 500N and his foot imprint is 0.5 m square. Calculate the total pressure exerted by a person when he stands on both feet.

Answers

The total pressure exerted by a person when he stands on both the feet is 10000000 Pascals

Explanation:

Given data

Weight of the person= 500 N

Area of the foot= 0.5 m ²/ 100 ×100

To find the pressure exerted we have the formula,

Pressure exerted= force/area

Pressure exerted= 500 ×100×100/0.5

Pressure exerted=10000000 Pascals

The total pressure exerted by a person when he stands on both the feet is 10000000 Pascals

Cells store energy in the form of what

Answers

Cells store energy either as carbohydrates or lipids (fats and oils).

Carbohydrates provide for fast, short term energy. They are a key part of cellular respiration.

Lipids provide for long term energy storage because storing lipids is much more effective than storing carbs. One gram of lipid can store twice as much as one gram of carbs. So to access this energy storage, cells must conduct hydrolysis (inserting a hydrogen and a hydroxide group to split off the energy).

Hope this helps!

1) Car A has a mass of 1,000 kg and is traveling 60 km/hr. Car B has a mass of 2,000 kg and is traveling 30 km/hr. Compare the kinetic energy of car A with that of car B?
A) equal
B) half as much
C) twice as much
D) four times as much

Answers

Answer: C

Explanation:

Calculate EkA -kinetic energy of car A

m=1000kg

Va=16.66 m/s

EkA=m*Va²/2

Eka=(1000kg*277.556m²/s²)/2

Eka=138 777.8 J

Calculate kinetic energy of CarB:

m=2000 kg

Vb=8.33 m/s

Ekb=(m*Vb²)/2

Ekb=(2000kg*69.39m²/s²)/2

Ekb=69 388.9 J

compare Eka with EkB

Eka/Ekb=138 777.8 J/69 388.9

Eka/Ekb=2

Final answer:

The kinetic energy of car A is twice as much as that of car B. This is calculated using the formula for kinetic energy, which is 1/2 * mass * (velocity)^2.

Explanation:

To compare the kinetic energy of car A with that of car B, we first need to understand the mathematical formula for kinetic energy, which is 1/2 * mass * (velocity)^2.

Let's calculate for each car:

For car A: kinetic energy = 1/2 * 1000 kg * (60 km/hr)^2 = 1800000 Joules
For car B: kinetic energy = 1/2 * 2000 kg * (30 km/hr)^2 = 900000 Joules

Therefore, car A has twice as much kinetic energy as car B.

Learn more about Kinetic Energy here:

brainly.com/question/26472013

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How are intensity sound and energy related

Answers

sound is a form of energy in that it consists fluctuations of air pressure . The speed of the fluctuations is measured in cycles per second or Hertz (HZ)

Intensity is how large the fluctuations are, also known as amplitude and for the sound the unit is decibels of sonic pressure level (dB SPL)

Which object below involves two energy transformations when used?a) A radio plugged into an electrical outlet

b) A toaster

c) A battery-operated remote control car

d) A blender