PHYSICS MIDDLE SCHOOL

A weightlifter lifts a 1400 N barbell 2.5 meters. Calculate the work done during the lift

Answers

Answer 1
Answer:

Answer: W = 3500 J

Explanation: Work is the product of the amount of force and the perpendicular distance or W = Fd.

W = Fd

   = 1400 N ( 2.5 m )

   = 3500 J

Answer 2
Answer:

Answer:

Force = 1400N

Displacement = 2.5 m

work done = F×D

=1400×2.5

= 3500 joule

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Ladybug walks 10 cm forward and 5 cm backwards in 20 seconds what is the average speed of ladybug what is the average velocity

Answers

Answer:

Average speed = 0.0075 m/s

Average velocity = 0.0025 m/s along forward direction

Explanation:

Speed is the ratio of distance and time and velocity is the ratio of displacement and time.

Distance traveled = 10 + 5 = 15 cm = 0.15 m

Displacement = 10 - 5 = 5 cm = 0.05 m

Time = 20 seconds

\texttt{Average speed = }\frac{\texttt{Distance}}{\texttt{Time}}\n\n\texttt{Average speed = }(0.15)/(20)=7.5* 10^(-3)m/s\n\n\texttt{Average velocity = }\frac{\texttt{Displacement}}{\texttt{Time}}\n\n\texttt{Average velocity = }(0.05)/(20)=2.5* 10^(-3)m/s

Average speed = 0.0075 m/s

Average velocity = 0.0025 m/s along forward direction

Hey!

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Formula: Distance / Time = Speed

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Solution:

Speed = 15/20 = 0.75cm/sec

Velocity = 5/20 = 0.25cm/sec

10 + 5 = 15 (distance traveled)

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Answer:

Speed = 0.75cm/sec

Velocity = 0.25cm/sec going forward.

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Hope This Helped! Good Luck!

For the definition of Observation, What question can I ask based on the definition?

Answers

How would one use their senses to gather information to help answer a hypothesis?

Thermal energy is transferred as heat from a warmer object to a cooler object until Select one: a. all of the energy from the hot object is transferred to the cold object. b. the temperature is the same in both objects. c. all of the energy from the cold object is transferred to the hot object. d. the thermal energy is converted into another type of energy such as light.

Answers

Answer: Option B

Explanation:

When the thermal energy is transferred from a hotter body to the colder body then the transfer of energy takes place until the temperature of both the objects are same.

The energy from the hotter body is transferred to the colder body. Example: The heat transfer from the hotter water takes place into the colder water.

The energy transfer will stop only when the temperature of both the water will be same.

I'm like 98% it's D.

Each element is made up of only one kind of_________

Answers

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Answers

Pressure. The bricks sitting on top of each other are pressing down on the ones below each brick. (The motar also is acting as a variable). 
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