100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
PHYS 273 –QUIZ Questions and Answers with complete solution $13.49   Add to cart

Exam (elaborations)

PHYS 273 –QUIZ Questions and Answers with complete solution

 4 views  0 purchase
  • Course
  • Institution

PHYS 273 –QUIZ Questions and Answers with complete solution

Preview 2 out of 14  pages

  • November 13, 2023
  • 14
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
  • Unknown
avatar-seller
PHYS 273 –QUIZ QUESTIONS

LESSON 1: Introduction to Energy

● If you double the speed of an object how does its kinetic energy change?
o It quadruples (4x)
● If the temperature of an object increases, the thermal energy…
o Always increases
● The energy stored in coal is an example of…
o Chemical energy
● Dino and Jake are out for a walk together pushing their strollers. They each exert the
same amount of force on their strollers. Dino walks twice as far as Jake. Compare work.
o Dino does twice as much work as Jake.
● The energy due to an object’s motion is called…
o KE (kinetic energy)
● Energy is…
o The ability to do work
● The sun’s energy reaches Earth in the form of…
o Electromagnetic energy
● You pick up an apple up off the ground and lift it up one meter to the top of a table. What
is happening?
o Increase the apple’s gravitational potential energy (GPE)
● The energy carried by light is called…
o Electromagnetic energy
● A joule is…
o The work done by one newton of force acting over one meter
● The metric unit of energy is…
o Joule
● You try to pick up your mom’s car but it is too heavy and it doesn’t move. After you are
very tired. Is work done or not done and why?
o No work is done on the car because it did not move
● Work is….
o The transfer of energy
● Mass being converted to energy is an example of…
o Nuclear energy
● The “c” in E=mc^2 refers to…
o The speed of light
● T or F: Saying “the electromagnetic spectrum” is the same as saying “visible light”.
o False
● The energy due to the motion of atoms in a material is…
o Thermal energy
● A calorie is…
o The amount of energy requires to raise the temperature of 1g of water by 1oC.
● T or F: All electromagnetic radiation is visible light
○ False
LESSON 2: Energy Transfer and the Conservation of energy

● T or F: For the Law of Conservation of Energy work, we must turn off lights, heaters, etc.
when we leave the house.
o False

, ● T or F: In an isolated system energy can be transformed from one form to another, but
the total energy in the system must stay constant.
o True
● Clothes dryer consumes 2500W of energy. In 2s how much energy does the dryer use?
o 5000 joules
● You lift a cat from the ground up to a shelf 2 meters above the ground. Which is a
description of the energy flow?
o Chemical energy to GPE
● A laser is powered by a battery and is used to heat up a spot on a piece of paper. What
is the energy flow?
o Chemical to electric to electromagnetic to thermal
● Which of the following is closest to being an isolated system?
o A very well insulated, opaque cooler
● You are camping & you start a wood fire & use it to boil some H2O in a pot. Flow of En?
o Chemical to Thermal
● Plants need light in order to grow. They use the process of photosynthesis for this. What
is the energy transfer involved?
o Electromagnetic to Chemical
● The Law of Conservation of Energy
o Is a fundamental law of physics with no known exceptions.
● T or F: In a system which is NOT isolated the total amount of energy must stay constant.
o False
● A ball is rolling down a hill and gaining speed. What is happening?
o The ball is losing potential energy and gaining kinetic energy
● A chair is sliding across a rough horizontal floor. The chair starts with 100J of KE and
slows down and comes to a stop. What happened to the KE of the chair?
o The KE was transformed into heat due to friction with the floor
● T or F: If the total energy of a system increases this does not necessarily mean that
energy was added to the system.
o False
● T or F: According to the Law of Conservation of Energy if solar panels use the sun’s
energy in Arizona, then there will be less solar energy for us to use in Canada.
o False
● Which is not a unit of Power?
o Joules
 Your little sister drops a bag of candy on your head from the roof of your house. Right
before it hits your head it is moving quickly. Describe the candy’s En, from roof to head.
o The candy has lost potential energy and gained kinetic energy.
● T or F: Home appliances that produce heat tend to be low power.
o False

LESSON 3: Thermodynamics, Heat Engines, Power Generations

● Generators convert ….
○ Mechanical energy to electrical energy
● Heat engines convert…
○ Thermal energy to mechanical energy
● If the engine in your car produces 30 joules of useful work for every 100 joules of
gasoline used, what is its efficiency?
○ 30%

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Wiseman. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $13.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

81531 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling

Recently viewed by you


$13.49
  • (0)
  Add to cart