This topic contains a solution. Click here to go to the answer

Author Question: An object of mass m moving in a certain direction has a kinetic energy of 4.0 J. It hits a wall and ... (Read 66 times)

james

  • Hero Member
  • *****
  • Posts: 573
An object of mass m moving in a certain direction has a kinetic energy of 4.0 J. It hits a wall and comes back with half its original kinetic energy. If the speed of the object on return is 2.0 m/s, what is the mass of the object?
 
  A) 2.0 kg
  B) 2.8 kg
  C) 3.8 kg
  D) 1.0 kg
  E) 4.0 kg

Question 2

In fluid flow, the character of the flow can be determined by the Reynolds number, Re, which is a dimensionless quantity that can be expressed in terms of the speed v of the fluid, the density  (mass per unit volume) of the fluid, the viscosity
 
  of the fluid, and a length D which is characteristic to the flow. Re can be expressed in the form Re = kvabDc, where k, a, b, and c are dimensionless constants. What must be the values of b, c, and d? The dimensions of viscosity are M/LT. A) b = 1, c = -1, d = 1
  B) b = 1, c = -1, d = -1
  C) b = -1, c = 1, d = 1
  D) b = -1, c = 1, d = -1
  E) b = -1, c = -1, d = 1



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

debra928

  • Sr. Member
  • ****
  • Posts: 342
Answer to Question 1

D

Answer to Question 2

C





 

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

Women are 50% to 75% more likely than men to experience an adverse drug reaction.

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

For a complete list of videos, visit our video library