PHYSICS HIGH SCHOOL

You begin sliding down a 15∘ ski slope. part a ignoring friction and air resistance, how fast will you be moving after 10 s?

Answers

Answer 1

Answer:

Answer:

25 m/s

Explanation:

This is a uniformly accelerated motion, so the velocity at time time is given by

$v(t) = v_0 +at$

where $v_0$ is the initial velocity and a is the acceleration.

In this problem, the initial velocity is zero: v0=0. The acceleration is the component of the gravitational acceleration projected along the direction of motion, so

$a=g sin \theta = (9.8 m/s^2) sin 15^(\circ)=2.5 m/s^2$

Therefore, the velocity after t=10 s will be

$v(10 s)=at=(2.5 m/s^2)(10 s)=25 m/s$

Answer 2

Answer:

Final answer:

Ignoring friction and air resistance, a skier moving down a 15-degree slope with an acceleration of 2.1 m/s² will be traveling at a speed of 21 m/s after 10 seconds.

Explanation:

This question is asking about the speed of a skier sliding down a 15-degree ski slope under the influence of acceleration due to gravity, ignoring friction and air resistance. Given the acceleration of the skier is 2.1 m/s², we can use the equation of motion to find the velocity after a certain time (10 seconds).

This equation is v = u + at, where u is the initial velocity (which is 0 m/s as the skier starts from rest), a is the acceleration (2.1 m/s²), and t is time in seconds (10 seconds). So, v = 0 + 2.1 * 10 = 21m/s.

Therefore, ignoring friction and air resistance, the skier will be moving at a speed of 21 m/s after 10 seconds down the 15-degree ski slope.

Learn more about Physics of Skiing here:

brainly.com/question/10595258

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A skier pushes her ski poles against the ground. She begins to move across the snow. Earth does not seem to move. Identify the action and reac-tion forces in this example, and explain why the skier moves but Earth does not seem to.

Answers

Answer:

The earth has a larger mass and therefore more inertia.

Explanation:

Water pressure in a lake is greater __________. a. at the bottom b. at the surface c. at any point, for pressure is the same d. throughout midway to the bottom

Answers

Answer:

The correct answer a

Explanation:

In the fluid pressure is a measure of force per unit area, in this case force is the weight of the fluid that increases as we descend. Therefore, the pressure increases with the depth of the fluid.

The correct answer a

Answer:

a. at the bottom

Explanation:

Since water at the bottom of the lake is under pressure by all the water molecules above it plus atmospheric pressure. It is no doubt that the pressure at the bottom of the lake is larger than pressure in the middle and at the surface of the lake.

Imagine that current is flowing couterclockwise around a squre loop of wire in front of you