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3 years ago

An object of mass m slides down an incline with angle 0.

Physics

1 answer:

sp2606 [1]3 years ago

8 0

Answer:

C. mg sin(θ)

Explanation:

The plane is incline and the only force acting in the object is the gravity, so you multiply mg per sin(θ) because sin(θ) gave you the part of the gravity acting in the horizontal direction parallel with the inclined surface

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1.) A ski jump is angled at 40° and the skier is launched at 25 m/s. A.) What was her highest

prohojiy [21]

A) 13.2 m

The motion of the skier is a projectile motion, which consists of two independent motions:

- a horizontal motion with constant speed

- a vertical motion with constant acceleration $g=-9.8 m/s^2$ (acceleration of gravity) downward

To find the maximum height of her trajectory, we are only concerned with her vertical motion.

The initial vertical velocity upward is

$u_y = u_0 sin \theta = (25) sin 40^{\circ} =16.1 m/s$

then we can use the following SUVAT equation:

$v_y^2 - u_y^2 = 2ah$

where

$v_y=0$ is the final vertical velocity, which is zero at the maximum height

$u_y = 16.1 m/s$ is the initial vertical velocity

$a=g=-9.8 m/s^2$

h is the maximum height

Solving for h,

$h=\frac{v_y^2-u_y^2}{2g}=\frac{-(16.1)^2}{2(-9.8)}=13.2 m$

B) 1.64 s

The time needed to reach the highest point can be found by analyzing again the vertical motion only. In fact, we can use the following SUVAT equation:

$v_y = u_y +at$

where

$u_y = 16.1 m/s$

$a=g=-9.8 m/s^2$

At the maximum height, the vertical velocity is zero:

$v_y=0$

So we can solve the equation to find the corresponding time:

$t=\frac{v_y-u_y}{a}=\frac{0-16.1}{-9.8}=1.64 s$

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4 years ago

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AleksAgata [21]

Answer:

Done

Explanation:

The differences are significant. The main disadvantages of a pinhole camera compared to a modern camera are:

Proper exposure requires a trial and error approach.

Requires manual control of shutter speed (difficult to control)

Poor image quality (due to diffraction effects).

Long exposures (lead to blurry images if the subject moves).

Fixed aperture or f-stop.

Advantages include:

Large depth of field.

Inexpensive

Robust and nearly 100% reliable.

If used properly can create artistic effects.

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