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
Anarel [89]
3 years ago
12

You push a 45 kg wooden box across a wooden floor at a constant speed of 1.0 m/s. The coefficient of kinetic friction is 0.25. N

ow you double the force on the box. How long would it take for the velocity of the crate to double to 2.0 m/s
Physics
1 answer:
tigry1 [53]3 years ago
8 0

Answer:

       t = 0.408 s

Explanation:

In this exercise we will use Newton's second law to find the acceleration and the kinematic relationships to find the time.

We use Newton's second law, for the first condition where the acceleration is zero

X axis

           F - fr = 0

Y Axis  

          N- W = 0

The expression for friction force is

        fr = μ N

       fr = μ mg

We substitute

      F = μ m g

This is the value for the applied force, now we apply the second condition, in this case the system has an acceleration

X axis

          2F- fr = ma

         a = (2F -fr) / m

Axis y

         N -W = 0

The friction force has the expression

        fr = μ N

        fr = μ W

We substitute

       a = (2F - μ m g) / m

       a = (2 μ mg - μ mg) / m

       a = μ g (2-1) = μ g

We calculate

      a = 0.25  9.8   1

      a = 2.45 m / s²

With this acceleration value we use the kinematics ratio to find the time

       v = v₀ + a t

The initial speed is 1 m / s and the final speed is 2 m / s

       t = (v-v₀) / a

       t = (2-1) / 2.45

       t = 0.408 s

You might be interested in
If Angle "a" is 25°, Angle "b" is:
Leokris [45]
I would say B but I have no clue
6 0
3 years ago
What is the relationship between the strength of an
Anastaziya [24]

Answer:

As the number of turns in the coil increases, the strength  of the electromagnet increases.

Explanation:

When current flows through a coil the coil behaves as an electromagnet. The strength of electromagnet depend the amount of current, no of turns of coil and the core of coil.

B=μ₀ N I

μ₀ = permeability of the core

N = Number of turns of the coil

I = Current flowing through the coil

Increasing the current and number of coils increase the strength of electromagnet.

3 0
3 years ago
Why do people have symptoms in their bodys
weeeeeb [17]

Body works like a computer whenever there is any problem it warns you and those warnings are termed as symptoms. Of the body doesn't show symptoms we won't be able to detect the problem in our body.

5 0
2 years ago
Read 2 more answers
25 POINTS FOR CORRECT ANSWER
castortr0y [4]
No.  I do not agree with Stefan.  Quite the contrary.  I disagree
with his description of "<span>angle of incidence" as the angle between
the surface of the mirror and the incoming ray. 

The correct description of "angle of incidence" is </span><span>the angle between
the NORMAL TO the surface of the mirror and the incoming ray. 

Thus, the true angle of incidence is the complement of the angle that
Stefan calculates or measures.</span>
5 0
3 years ago
Read 2 more answers
A car of mass 1500 kg is negotiating a flat circular curve of radius 50 m with a speed of 20 m/s.
Lilit [14]

Answer:

Explanation:

a. The source of centripetal force on the car is  (3) the static friction force.

b. ac = v²/R = (20²)/50 = 8 m/s²

c.  Fc = m(ac) = 1500(8) = 12 kN

d. μ = Fc/N = Fc/mg = 12000 / 1500(9.8) = 0.8163... ≈ 0.82

6 0
3 years ago
Other questions:
  • if the speed of sound through the air is rounder 80 meters per second what will be the change in temperature of the air​
    10·1 answer
  • The specific resistance of wire​
    12·1 answer
  • which describes the attraction or repulsion caused by magnets? a. magnetic domain b. magnetic force c. magnetic field
    9·1 answer
  • 1. A car begins at a speed of 3 m/s and accelerates at 2 m/s2
    6·1 answer
  • Without being able to look into the earth , a scientist would not be able to determine if this region has karst topography
    5·2 answers
  • If a laser beam is shot straight up from the bottom of a pool so that it intersects the pools surface in a perpendicular fashion
    5·1 answer
  • What do waves transmit? (Points : 1)
    5·2 answers
  • Explain how Newton's third law is applied when a rocket ship is being launched?
    10·1 answer
  • Why do we need satellites?<br> (There is no science colum)
    6·1 answer
  • If the coefficient of kinetic friction between the puck and the ice is 0.05, how far does the puck slide before coming to rest?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!