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
Allushta [10]
3 years ago
14

Explain why free fall acceleration near earths surface is constant

Physics
1 answer:
Naya [18.7K]3 years ago
4 0
Because gravity is constant 
<span>the only force acting in free-fall is gravity which points downward at 9.8 m/s</span>
You might be interested in
A dime is placed in front of a concave mirror that has a radius of curvature R = 0.40 m. The image of the dime is inverted and t
andrew11 [14]

Answer:

distance between the dime and the mirror, u = 0.30 m

Given:

Radius of curvature, r = 0.40 m

magnification, m = - 2 (since,inverted image)

Solution:

Focal length is half the radius of curvature, f = \frac{r}{2}

f = \frac{0.40}{2} = 0.20 m

Now,

m = - \frac{v}{u}

- 2 = -\frac{v}{u}

\frac{v}{u} = 2                  (2)

Now, by lens maker formula:

\frac{1}{f} = \frac{1}{u} + \frac{1}{v}

\frac{1}{v} = \frac{1}{f} - \frac{1}{u}

v = \frac{uf}{u - f}            (3)

From eqn (2):

v = 2u

put v = 2u in eqn (3):

2u = \frac{uf}{u - f}

2 = \frac{f}{u - f}

2(u - 0.20) = 0.20

u = 0.30 m

6 0
3 years ago
In the average US household, the television is on 6.75 hours/day! How many hours will have passed after 77.7 years (the average
Nady [450]

Answer:

191433.4 hours

Explanation:

We are given that In the average US household, the television is on 6.75 hours/day! How many hours will have passed after 77.7 years (the average lifeexpectancy of an American)?

1 year - 365 days

Given that the television is on 6.75 hours/day.

If 1 year = 365 days

Convert 77.7 years to days by multiplying it by 365

77.7 × 365 = 28360.5 days

So the number of hours will be:

28360.5 × 6.75 = 191433.375 hours

Therefore, 191433.4 hours will pass.

Non of the options is correct.

6 0
3 years ago
You are driving at the speed of 27.7 m/s (61.9764 mph) when suddenly the car in front of you (previously traveling at the same s
densk [106]

Here when car in front of us applied brakes then it is slowing down due to frictional force on it

So here we can say that friction force on the car front of our car is given as

F_f = \mu m g

So the acceleration of car due to friction is given as

F_{net} = - \mu mg

a = \frac{F_{net}}{m}

a = -\mu g

now it is given that

\mu = 0.868

g = 9.81 m/s^2

so here we have

a = -0.868 * 9.81

a = -8.52 m/s^2

so the car will accelerate due to brakes by a = - 8.52 m/s^2

4 0
3 years ago
i just want a reason to live if my mom is always on me about everything and screams in my face to move out i have zero will to l
prisoha [69]

Answer:

I understand how u feel if u need someone to talk to I will be here for u my stepmom is like that i will be here for u if u wana talk

Explanation:

5 0
2 years ago
Read 2 more answers
GUYS PLEASE HELP!! The number of individuals that die in a population in a certain time period is the _______ WHAT IS IT!? Pleas
ryzh [129]
I think it "Death rate" but I am not very sure though.
3 0
3 years ago
Other questions:
  • Two point charges of -7uC and 4uC are a distance of 20
    9·2 answers
  • If i have a kinematic equation vf^2=vi^2-2*a(xf-xi), how can i solve for xi step by step
    8·1 answer
  • When you are ice skating, to get started, you push your skate backwards on the ice and, as a result, begin to move forward. Whic
    7·2 answers
  • If you lose control of your vehicle and collide with a fixed object, such as a tree, at 60 m.p.h., the force of impact is the sa
    14·1 answer
  • Describe what happens, at a microscopic level, when an object is charged by rubbing. For instance, what happens when a plastic p
    14·1 answer
  • Which statement best describes the density of the outer planets?
    6·2 answers
  • A spacecraft at rest has moment of inertia of 100 kg-m^2 about an axis of interest. If a 1 newton thruster with a 1 meter moment
    9·1 answer
  • a trampoline launches a 50kg person 2m into the air. if the springs push with 1960N of force, how much displacement was there in
    14·2 answers
  • What is the independent variable of the graph above?
    7·1 answer
  • Can someone please answer this, ill give you brainliest and your earning 50 points.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!