This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. ... (Read 203 times)

P68T

  • Hero Member
  • *****
  • Posts: 509
on: Jul 29, 2018
A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building.
 
  What is the minimum amount of work that the worker did in lifting the bucket? A) 3.92 kJ
  B) 400 J
  C) 560 J
  D) 4.08 kJ
  E) 160 J

Question 2

A heavy frog and a light frog jump straight up. They push off in such a way that they both have the same kinetic energy just as they leave the ground. Assume air resistance is negligible.
 
  Which of the following statements about these frogs are correct? (There could be more than one correct choice.) A) Just as they leave the ground, the heavier frog is moving faster than the lighter frog.
  B) Just as they leave the ground, the lighter frog is moving faster than the heavier frog.
  C) They both leave the ground with the same speed.
  D) The lighter frog goes higher than the heavier frog.
  E) The heavier frog goes higher than the lighter frog.
  F) Both frogs reach the same maximum height.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

phuda

  • Sr. Member
  • ****
  • Posts: 348
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

B, F


P68T

  • Hero Member
  • *****
  • Posts: 509
Reply #2 on: Jul 29, 2018
TY


phuda

  • Sr. Member
  • ****
  • Posts: 348
Reply #3 on: Jul 29, 2018
You're welcome


« previous next »
 

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Did you know?

Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Ground cover and colour such as shown here in (a) white sand Ground cover and colour such as shown here in (a) white sand
Stonehenge From The Ground Stonehenge From The Ground
Role of Factors of Production in Determining Output per Worker, 2009 Role of Factors of Production in Determining Output per Worker, 2009
Children were given the same set of concrete operations tasks five times Children were given the same set of concrete operations tasks five times
A 500-kg cannon fires a 4.0-kg projectile with a velocity of 500 m/s relative to the ground. ... A 500-kg cannon fires a 4.0-kg projectile with a velocity of 500 m/s relative to the ground. ...
Video: Major Elements in Biological Molecules: Lipids

For a complete list of videos, visit our video library