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

Author Question: A karate master strikes a board with an initial velocity of 12.0 m/s, decreasing to 3.0 m/s as his ... (Read 119 times)

humphriesbr@me.com

  • Hero Member
  • *****
  • Posts: 550
on: Jul 28, 2018
A karate master strikes a board with an initial velocity of 12.0 m/s, decreasing to 3.0 m/s as his hand passes through the board. If the time of contact with the board is 0.002 s, and the mass of the coordinated hand and arm is 1.0 kg, what is the force exerted on the board?
 a. 7.5E+3 N
  b. 1.8E2 N
  c. 3.0E2 N
  d. 4.5E+3 N
  e. 6.0E+3 N

Question 2

A boxcar of mass 125 tons at rest becomes uncoupled on a 2.0 grade. If the track is considered to be frictionless, what speed does the boxcar have after 9.0 seconds?
 a. 4.0 m/s
  b. 0.038 m/s
  c. 31 m/s
  d. 3.1 m/s
  e. 0.31 m/s


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

af

  • Sr. Member
  • ****
  • Posts: 356
Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

d


humphriesbr@me.com

  • Hero Member
  • *****
  • Posts: 550
Reply #2 on: Jul 28, 2018
TY


af

  • Sr. Member
  • ****
  • Posts: 356
Reply #3 on: Jul 28, 2018
You're welcome


« previous next »
 

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Did you know?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Formation of additional eyes in Drosophila caused by the abnormal expression of a master control gen Formation of additional eyes in Drosophila caused by the abnormal expression of a master control gen
Initial velocities of enzyme-catalyzed reactions Initial velocities of enzyme-catalyzed reactions
Nap master Nap master
Nap master (fixed) Nap master (fixed)
Master Sculptor Vulca APULU (APOLLO) "أبولو" Master Sculptor Vulca APULU (APOLLO) "أبولو"
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: Chronology of leptin research (A history of leptin research)

For a complete list of videos, visit our video library