Author Question: A 1.6-kg block slides down a plane (inclined at 25 with the horizontal) at a constant speed of 2.0 ... (Read 124 times)

nautica902

  • Hero Member
  • *****
  • Posts: 591
A 1.6-kg block slides down a plane (inclined at 25 with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
 a. +28 W
  b. +13 W
  c. -13 W
  d. -28 W
  e. +6.5 W

Question 2

A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22 above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?
 a. 2.3 W
  b. 2.0 W
  c. 1.4 W
  d. 1.7 W
  e. 1.2 W



lucas dlamini

  • Sr. Member
  • ****
  • Posts: 327
Answer to Question 1

C

Answer to Question 2

A



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

For a complete list of videos, visit our video library