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
wariber [46]
3 years ago
15

What average force is necessary to bring a 50.2-kg sled from rest to a speed of 2.8 m/s in a period of 20.1 s?

Physics
1 answer:
GaryK [48]3 years ago
7 0

To solve this problem we will use the concepts related to the Impulse-Momentum Theorem for which it is specified as the product between force and change in time

\Delta p = F\Delta t

And

\Delta p = m\Delta v

Where,

F = Force

\Delta t = \text{Change in Time}

\Delta v = \text{Change in velocity}

m = mass

Rearranging to find the Force we have that

F = \frac{\Delta p}{\Delta t}

Using the expression between mass and velocity

F = \frac{m(v_f-v_i)}{\Delta t}

Our values are given as,

m = 50.2kg\\v_i = 0m/s \\v_f = 2.8m/s \\\Delta t = 20.1s

Then replacing we have that

F = 6.99N

Therefore the average force is 6.99N

You might be interested in
When Earth and the Moon are separated by a
Wewaii [24]
     Using the Universal Gratitation Law, we have:

F= \frac{MmG}{d^2}  \\ MmG=2*10^{20}*(3.84*10^8)^2 \\ MmG=29.4912*10^36
 
     Again applying the formula in the new situation, comes:

F= \frac{MmG}{d^2} \\ F= \frac{29.4912*10^36}{(1.92*10^8)^2} \\ \boxed {F=8*10^{20}}

Number 4

If you notice any mistake in my english, please let me know, because i am not native.
6 0
3 years ago
Read 2 more answers
A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory
____ [38]

At the highest point in its trajectory, the ball's acceleration is zero but its velocity is not zero.

<h3>What's the velocity of the ball at the highest point of the trajectory?</h3>
  • At the highest point, the ball doesn't go more high. So its vertical velocity is zero.
  • However, the ball moves horizontal, so its horizontal component of velocity is non - zero i.e. u×cosθ.
  • u= initial velocity, θ= angle of projection

<h3>What's the acceleration of the ball at the highest point of projectile?</h3>
  • During the whole projectile motion, the earth exerts the gravitational force with a acceleration of gravity along vertical direction.
  • But as there's no acceleration along vertical direction, so the acceleration along vertical direction is zero.

Thus, we can conclude that the acceleration is zero and velocity is non-zero at the highest point projectile motion.

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory

A- neither the ball's velocity nor its acceleration are zero.

B- the ball's acceleration points upward.

C- the ball's acceleration is zero but its velocity is not zero.

D- the ball's velocity points downward.

Learn more about the projectile motion here:

brainly.com/question/24216590

#SPJ1

7 0
2 years ago
Signment
jeka94

Answer:

v = 5.15 m/s

Explanation:

At constant velocity, the cable tension will equal the car weight of 984(9.81) = 9,653 N

As the cable tension is less than this value, the car must be accelerating downward.

7730 = 984(9.81 - a)

a = 1.95 m/s²

kinematic equations s = ut + ½at² and v = u + at

-5.00 = u(4.00) + ½(-1.95)4.00²

u = 2.65 m/s    the car's initial velocity was upward at 2.65 m/s

v = 2.65 + (-1.95)(4.00)

v = -5.15 m/s

3 0
2 years ago
What are the 3 main branches of natural sciences
ICE Princess25 [194]

Answer:

Physical science, Earth science, and life science.

4 0
3 years ago
Read 2 more answers
What is the definition of electrical power?
Nonamiya [84]
An electric power measure the rate of electrical energy transfer by an electric circuit per unit of time.
6 0
1 year ago
Other questions:
  • An ion with charge of Q = +3.2 x 10-19 C is in a region where a uniform electric field of magnitude E = 5.0 X 105 V/m is perpend
    7·1 answer
  • You are an engineer helping to design a roller coaster that carries passengers down a steep track and around a vertical loop. Th
    13·2 answers
  • Select the correct answer.
    14·2 answers
  • An air bubble has a volume of 1.3 cm3 when it is released by a submarine 160 m below the surface of a freshwater lake. What is t
    15·1 answer
  • What should you do immediately if a boat motor catches fire?
    15·1 answer
  • Me - HS_SCLPhysical Science,
    8·1 answer
  • Psychological disorders:
    8·2 answers
  • Physical isolation of atrial muscle cells from ventricular muscle cells is a function of which of the following?
    7·1 answer
  • Until a train is a safe distance from the station, it must travel at 5 m/s. Once ti
    15·1 answer
  • Please help! the first person to answer this correctly will get a brainlist
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!