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MArishka [77]
3 years ago
13

Sarah, whose mass is 40 kg, is on her way to school after a winter storm when she accidentally slips on a patch of ice whose coe

fficient of kinetic friction is 0.05, slides to the right, and comes to a stop after 6 seconds. What is sarah’s acceleration as she slides to a stop?
Physics
1 answer:
RideAnS [48]3 years ago
4 0

Sarah's acceleration is -0.49 m/s^2

Explanation:

The force of kinetic friction acting on Sarah has a magnitude which is given by:

F_f = \mu mg

where

\mu is the coefficient of kinetic friction

m is Sarah's mass

g is the acceleration of gravity

Moreover, according to Newton's second law of motion, we know that the net force on Sarah is equal to its mass times its acceleration:

F=ma

where a is the acceleration

Since the force of friction is the only force acting on Sarah, we can say that the net force is equal to the force of friction, therefore:

F=-\mu mg = ma

where the negative sign is due to the fact that the force of friction has a direction opposite to the motion of Sarah. Solving for a, we find

a=-\mu g

And substituting the following values:

\mu = 0.05 (coefficient of friction)

g=9.81 m/s^2 (acceleration of gravity)

we find:

a=-(0.05)(9.81)=-0.49 m/s^2

Learn more about acceleration and forces:

brainly.com/question/11411375

brainly.com/question/1971321

brainly.com/question/2286502

brainly.com/question/2562700

#LearnwithBrainly

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Urgent help needed in number four.<br>Thank you in advance!​
likoan [24]

The energy produced by the headlamp at the end of 5 minutes is determined as 1,440 J.

<h3>Energy supplied by the lamp</h3>

The energy supplied by the lamp is calculated as follows;

E = Pt

E = IVt

where;

  • I is current = 0.4 A
  • V is voltage = 12 V
  • t is time = 5 mins = 5 x 60 s = 300 s

E = 0.4 x 12 x 300

E = 1,440 J

Thus, the energy produced by the headlamp at the end of 5 minutes is determined as 1,440 J.

Learn more about energy here: brainly.com/question/25959744

#SPJ1

6 0
2 years ago
A football player kicks a ball with an initial velocity of 25 m/s at an angle of 53 degrees above the horizontal. The vertical c
Verdich [7]

Answer:

20 m/s

Explanation:

initial velocity, u= 25m/s

u has two components. one in horizontal and in one vertical.

so,

u sin theta = vertical component.

=> u sin theta = 25× 4/5

= 20 m/s

7 0
2 years ago
The average height of an apple tree is 4.00 meters. How long would it take an apple falling from that height to reach the ground
kati45 [8]

Answer:

The time is 0.90 sec.

Explanation:

Given that,

Height = 4.00 m

We need to calculate the time

Using equation of motion

s = ut-\dfrac{1}{2}(-g)t^2

For free fall, u = 0

t =\sqrt{\dfrac{2s}{g}}

Where, s = distance

g = acceleration due to gravity

t = time

Put the value into the formula

t =\sqrt{\dfrac{2\times4.00}{9.8}}

t= 0.90\ sec

Hence, The time is 0.90 sec.

3 0
3 years ago
Thermal energy and temperature both relate to the amount of ______ energy of moving particles of matter.​
Whitepunk [10]

Thermal energy and temperature both relate to the amount of __energy____ energy of moving particles of matter.​

hope this helps

Explanation:

5 0
2 years ago
What an image of a distant object is brought into focus in front of a persons retina the fact is called
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When the image of a distant object is brought into focus of front of a person's retina, the defect is called: nearsightedness.
7 0
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