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3 years ago

How does the horizontal velocity of a projectile change throughout its motion?

1 answer:

3 0

The force of gravity pulls vertically down on the object. It does not pull left or right, so there are no horizontal forces due to gravity. This means the horizontal velocity remains constant throughout the object's projectile parabolic path.

Note: this is assuming wind resistance is ignored. If you account for wind resistance, then the object will slow down because the air particles push against the object and impede its progress.

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a 0.0215m diameter coin rolls up a 20 degree inclined plane. the coin starts with an initial angular speed of 55.2rad/s and roll

algol13

Answer:

$h = 0.0362\,m$

Explanation:

Given the absence of non-conservative force, the motion of the coin is modelled after the Principle of Energy Conservation solely.

$U_{g,A} + K_{A} = U_{g,B} + K_{B}$

$U_{g,B} - U_{g,A} = K_{A} - K_{B}$

$m\cdot g \cdot h = \frac{1}{2}\cdot I \cdot \omega_{o}^{2}$

The moment of inertia of the coin is:

$I = \frac{1}{2}\cdot m \cdot r^{2}$

After some algebraic handling, an expression for the maximum vertical height is derived:

$m\cdot g \cdot h = \frac{1}{4}\cdot m \cdot r^{2}\cdot \omega_{o}^{2}$

$h = \frac{r^{2}\cdot \omega_{o}^{2}}{g}$

$h = \frac{(0.0108\,m)^{2}\cdot (55.2\,\frac{rad}{s} )^{2}}{9.807\,\frac{m}{s^{2}} }$

$h = 0.0362\,m$

6 0

4 years ago

Which instrument gives circumference of golf ball

Vesna [10]

Vernier caliber is used

6 0

3 years ago

The pages of a book are numbered 1 to 200 and each

never [62]

Answer:

10.4mm

Explanation:

2 pages = 1 leaf

200 pages = 100 leaves

100 × 0.10 = 10 mm thickness

Total thickness = 2(0.20) +10 = 0.4+10 = 10.4mm

6 0

3 years ago

A student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour. Her average velocity is?

arsen [322]

Answer:

2 m/s

Explanation:

Given that a student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour.

The total time = 1 hour

The vertical displacement = 1 - 1

Vertical displacement = 0

Horizontal displacement = 4 - 2

Horizontal displacement = 2

Total displacement = sqrt (2^2 - 0^2)

Total Displacement = 2

Average velocity = displacement/time

average velocity = 2 / 1

Average velocity = 2 m/s

Therefore, her average velocity is 2 metres per second.

4 0

4 years ago

In a collision an object experiences impulses , this impulse can be determined by

astraxan [27]

In a collision an object experiences impulses, this impulse can be determined by the product of net force exerted upon it in the specific course of time.

<u>Explanation:</u>

An object experiences impulse due to the force exerted upon it in a particular time period.

i.e.

$\text {Impulse }=F \times \Delta t$

Where,

F - Force acted upon the object

$\Delta t$ - time interval for which the force act

According to the definition of Impulse, it is the integral of force (F) that acts upon any object over a time interval ∆t. It produces an equivalent change in the momentum and that too in the same direction as of the applied force (F).

Therefore, in order to find the impulse on an object, we have to find the force acted on it in a specific time interval.

8 0

3 years ago