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

Author Question: A runner generates 1260 W of thermal energy. If this energy has to be removed only by evaporation, ... (Read 937 times)

theo

  • Hero Member
  • *****
  • Posts: 698
on: Jul 29, 2018
A runner generates 1260 W of thermal energy. If this energy has to be removed only by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6  105 J/kg.
 
  A) 50 g
  B) 500 g
  C) 35 g
  D) 350 g
  E) 40 g

Question 2

A geologist suspends a 0.30-kg stone on an ideal spring. In equilibrium the stone stretches the spring 2.0 cm downward.
 
  The stone is then pulled an additional distance of 1.0 cm down and released from rest.
  (a) Write down the equation for the vertical position y of the stone as a function of time t, using the cosine function. Take the origin at the equilibrium point of the stone, with the positive y direction upward.
  (b) How fast is the stone moving at a time equal to 1/3 of its period of motion?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

tuwy

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

(a) y = -(0.010 m) cos(22 s-1 t) (b) 0.19 m/s


theo

  • Member
  • Posts: 698
Reply 2 on: Jul 29, 2018
:D TYSM

at

  • Member
  • Posts: 359
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Models for the electron orbitals and energy shells of carbon Models for the electron orbitals and energy shells of carbon
Characteristics of burns by depth of thermal injury Characteristics of burns by depth of thermal injury
U.S. Energy Consumption U.S. Energy Consumption
Tummy rock to release energy blocks in the torso and head. Tummy rock to release energy blocks in the torso and head.
Attributes of Major Energy Channels According to Traditional Chinese Medicine Attributes of Major Energy Channels According to Traditional Chinese Medicine
Comparing uncontrolled and controlled energy release. Comparing uncontrolled and controlled energy release.
Video: Functional zones in a mitochondrion

For a complete list of videos, visit our video library