1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
defon
3 years ago
7

A 2.2-kg block slides on a horizontal surface with a speed of v=0.80m/s and an

Physics
1 answer:
mina [271]3 years ago
5 0

Answer:

μ = 0.33

Equal to 3.2 m/s²

Explanation:

Draw a free body diagram of the block.  There are three forces:

Normal force N pushing up.

Weight force mg pulling down.

Friction force Nμ pushing opposite the direction of motion.

Sum of forces in the y direction.

∑F = ma

N − mg = 0

N = mg

Sum of forces in the x direction.

∑F = ma

Nμ = ma

Substitute.

mgμ = ma

μ = a/g

μ = (3.2 m/s²) / (9.8 m/s²)

μ = 0.33

As found earlier, the acceleration is a = gμ.  Since g and μ are constant, a is also constant, so it does not change with velocity.

You might be interested in
20. In a parallel RL circuit, 10 mA flows through the resistor and 4 mA flows through the inductor. What phase angle separates v
stellarik [79]

Answer:

Option D: 21.8 degrees

Explanation:

In a parallel RL circuit, the current in the resistor R and that in the inductor L are separated among themselves 90 degrees as illustrated in the attached image. In the image the current in the resistor is represented in orange, that of the inductor in blue, and the total current (vector addition of the previous two) is represented  in red, forming a certain angle (theta) with respect to the current in the resistor. The output voltage is the same as the input voltage as measured over the resistor R.

Therefore, the phase angle that separated output voltage and total current can be obtained using the fact that tan(phase angle) = \frac{I_l}{I_R} = \frac{x}{y} \frac{4}{10}, therefore the angle is the arctangent of 4/10:

arctang(\frac{4}{10} )= 21.801 degrees.

8 0
4 years ago
Read 2 more answers
The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is _______________
soldier1979 [14.2K]

Answer:

Transferred

Explanation:

It only changes from one state to another

7 0
3 years ago
Read 2 more answers
Name two methods scientist use to obtain empirical evidence
alisha [4.7K]

<span>The scientists use data and measurement to obtain empirical evidence. Data can be collected through direct observation or else experimentation. Empirical measurements and data can be gathered by using qualitative and quantitative methods. Empirical evidence contains the recording and analyzing the data which is a central part of scientific method.</span>

3 0
4 years ago
Huck Finn walks at a speed of 0.70 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the sho
ZanzabumX [31]

Answer

given,

Hunk Finn speed,v_y= 0.7 m/s

Speed of river,v_x = 1.50 m/s

Assuming the speed of the river is in x-direction.

Speed of Hunk Finn to be in y-direction.

Hunk velocity relative to river =

x = \sqrt{v_y^2+v_x^2}

x = \sqrt{2.74}

x =1.66\ m/s

Speed of Hunk relative to river = 1.66 m/s

direction of the boat

\theta =tan^{-1}(\dfrac{v_y}{v_x})

\theta =tan^{-1}(\dfrac{0.7}{1.50})

\theta = 25.01^{\circ}

Hence, angle of the raft is 24.01°

6 0
4 years ago
The 2 substances in the containers below were heated to 50 degrees Celsius; then left to cool to room Temp of 20 degrees Celsius
melisa1 [442]

Answer' RA

Explanation: I need points mb gang

8 0
2 years ago
Other questions:
  • A fairgrounds ride spins its occupants inside a flying saucer-shaped container. if the horizontal circular path the riders follo
    12·1 answer
  • How should the distance, D, between two point charges, q1 and q2, be changed to double their electric potential energy
    12·1 answer
  • What goes through evaporation
    9·2 answers
  • A layer of oil (n = 1.38) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid.
    15·1 answer
  • Use the motion map to answer the question, describe the position and velocity of the object based moo the motion map?
    6·1 answer
  • Suppose that the electric field in the Earth's atmosphere is E = 8.60 101 N/C, pointing downward. Determine the electric charge
    14·1 answer
  • Solve the equation<br> (2.40 x 10^7)* (3.10 x 10-5^-5)
    10·1 answer
  • If earth's axis was tilted 45 degrees at what latitudes
    6·1 answer
  • Thanks+ BRAINLIST only for correct answers
    15·2 answers
  • find an expression for the magnitude of the horizontal force f in the figure for which m1 does not slip either up or down along
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!