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4 years ago

What force is most responsible for the path of an object during projectile motion?

1 answer:

7 0

The gravitational force.

In fact, the motion of the projectile is composed by two independent motions:
- on the horizontal direction, it is a uniform motion (with constant speed)
- on the vertical direction, it is a uniformly accelerated motion, where the vertical acceleration g is given by the gravity exerted by the Earth on the projectile.

For this reason, the composition of the two motions results in a parabolic trajectory.

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Now suppose that the Earth had the same mass and radius as it currently does, but all of the mass was concentrated into a thin (

KiRa [710]

Answer:

The force of gravity at the shell will be extremely great on me due to the huge mass collapsed into the small radius.

<em>At the center of the shell, the gravitational forces all around should cancel out, giving me a feeling of weightlessness; which will be a lesser force compared to that felt while standing on the shell.</em>

Explanation:

For the collapsed earth:

mass = 5.972 × 10^24 kg

radius = 1 ft

according to Newton's gravitation law, the force of gravity due to two body with mass is given as

Fg = GMm/ $R^{2}$

Where Fg is the gravitational force between the two bodies.

G is the gravitational constant

M is the mass of the earth

m is my own mass

R is the distance between me and the center of the earths in each case

For the case where I stand on the shell:

radius R will be 1 ft

Fg = GMm/ $1^{2}$

Fg = GMm

For the case where I stand stand inside the shell, lets say I'm positioned at the center of the shell. The force of gravity due to my mass will be balanced out by all other masses around due to the shell of the hollow earth. This cancelling will produce a weightless feeling on me.

3 0

3 years ago

Acceleration is a change in _____.

Rus_ich [418]

Answer:

direction

Explanation:

4 0

3 years ago

Read 2 more answers

HELP with this please.

jasenka [17]

17. C. Isotopes
18. Tracers
19. Alpha Decay

6 0

3 years ago

Read 2 more answers

A jet plane is flying at a constant altitude. At time t1 = 0, it has components of velocity vx = 90 m/s, vy = 110 m/s. At time t

Vika [28.1K]

Answer:

a) See attachment.

b) a_avg = -8.66 i - 2.33 j

c) a = 195 degrees from + x-axis. |a_avg| = 8.97 m/s^2

Explanation:

Given:

- Initial Velocity V_i = (90 i + 110 j)

- Final velocity V_f = (-170 i + 40 j)

- t_i = 0

- t_f = 30.0 s

Find:

(a) Sketch the velocity vectors at t1 and t2. How do these two vectors differ?

(b) the components of the average acceleration

Solution:

- The change in velocity is given by:

Δ V = (V_f - V_i)

Δ V = ( -170 i - 90 i + 40 j - 110 j)

Δ V = (-260 i - 70 j)

- The change in time is given as:

Δ t = t_f - t_i = 30 - 0 = 30 s

-The average acceleration is:

a_avg = Δ V / Δ t

a_avg = (-260 i - 70 j) / 30

a_avg = -8.66 i - 2.33 j

- The magnitude of acceleration is:

|a_avg| = sqrt ( 8.66^2 + 2.33^2)

|a_avg| = sqrt (80.4245)

|a_avg| = 8.97 m/s^2

- The direction of acceleration is given by:

tan (Q) = a_y / a_x

Q = arctan(a_y / a_x)

Q = arctan(2.33 / 8.66)

Q = 15 degrees

Hence, 180 + 15 = a. a = 195 degrees from + x-axis.

8 0

3 years ago

At what speed should a ball of mass 2 kg be rolled in order to reach the other side of

Veronika [31]

Answer:

M g H = 1/2 M v^2 potential energy = kinetic energy

v^2 = 2 g H = 2 * 9.80 * 6 = 117.6 m/s^2

v = 10.8 m/s

(C)

6 0

2 years ago