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
rewona [7]
3 years ago
12

Anissa slides down a playground slide sloped at 25o. The coefficient of kinetic friction between Anissa and the slide is 0.15. I

f Anissa’s mass is 55 kg, how fast is she going 2.0 s after starting from rest?
Physics
1 answer:
Keith_Richards [23]3 years ago
4 0

Answer:5.62 m/s

Explanation:

Given

Inclination \theta =25^{\circ}

Coefficient of kinetic Friction \mu _k=0.15

mass of Anissa's m=55 kg

time interval t=2 s

acceleration of the system

a=g\sin \theta -\mu _kg\cos \theta

a=9.8\sin (25)-0.15\cdot 9.8\cos (25)

a=4.14-1.33=2.81 m/s^2

v=u+at

where v=Final Velocity

u=Initial Velocity

a=acceleration of system

t=time

v=0+2.81\times 2

v=5.62 m/s

You might be interested in
You exert of force of 75 newtons on a rock. You push and you push, but you can't budge it. You are exhausted! How much work did
sergiy2304 [10]
You performed 0 work for the fact that work means the distance of movement made on an object not the amount of force it is exposed to. 0 work because it didn't move
7 0
3 years ago
find the distance traveled in km when the average speed is 60 km per hour and the time taken is 3 and 1/2 hours​
Anna35 [415]

Answer:

210 km

Explanation:

60 x 3  1/2 = 210

3 0
3 years ago
How are EM waves and Mechanical waves different? * Check all that apply 5 points EM waves can travel through a vacuum. All EM wa
Ludmilka [50]

Particles transfer energy physically from one to the other either horizontally in a longitudinal wave, vertically in a transverse wave, or in circles in a surface wave. Waves can also be electromagnetic, which are always transverse and do not require a medium to propagate, like light waves traveling through space.

6 0
3 years ago
You hold a barbell in a horizontal position. The barbell’s center of mass is exactly mid-way between your two hands. A friend wa
Harrizon [31]

Explanation:

First consider that each hand works as a fulcrum: a pivot point where the barbell can rotate.

Now consider only the left hand. If the center of mass of the barbell is between hands (in the middle) it is displaced respect the fulcrum, therefore the weight which is pushing the bar downwards becomes a rotational force. The same thing happens to the other hand. Now, if more weight is added to the left hand the center of mass is displaced towards the left hand and depending how much weight is added, the center of mass will change its position and therefore the torque each hand experiences changes.

If the center of mass is still between hands: The torque remains almost the same changing only the magnitudes but not the direction.

If the center of mass is on the hand: there is no torque for the left hand because there is no leaver.

If the center of mass is to the left: now the torque changes direction and both hands need to stop it in the same direction.

(see diagram below)

6 0
3 years ago
List two things you should not do when giving a presentation
Gekata [30.6K]

Answer:

running or skipping

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • Arrange the events of the big bang in sequential order
    10·1 answer
  • What is the force exerted on a moving charge of -2.0 C at a 20° angle through a magnetic field of 3.0 x 10-4T with a
    10·1 answer
  • If I put one hand in hot tap water and the other in cold tap water then both in the same warm tap water what will happen
    14·1 answer
  • Which of these is the best description for a circuit with an open switch?
    7·1 answer
  • A third point charge q3 is now positioned halfway between q1 and q2. The net force on q2 now has a magnitude of F2,net = 14.413
    7·1 answer
  • How much work must be done in the car to slow it from 100km/h to 50km/h
    15·1 answer
  • jamal wanted only to test the effect of the free fall and so he put his system in a vacuum to prevent air resistance. In free fa
    15·2 answers
  • A 1.6 kg ball is attached to the end of a 0.40 m string to form a pendulum. This pendulum is released from rest with the string
    15·1 answer
  • The acronym used when referring to the Big Five Factors is OCEAN. True False
    10·2 answers
  • The displacement of a wave from the baseline.this affects thrloudness of sound
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!