A 52.0-kg sandbag falls off a rooftop that is 22.0 m above the ground. The collision between the sandbag and the ground lasts for a total of 17.0 ms. What is the magnitude of the average force exerted on the sandbag by the ground during the collision?

I don't even know where to start... what formulas should I be using?

1. A rock is thrown with an initial vertical velocity component of 30 m/s and an initial horizontal velocity component of 40 m/s.

a. What will these velocity components be one second after the rock reaches the top of its path?

b. Assuming the launch and landing heights are the same, how long will the rock be in the air?

c. Assuming the launch and landing heights are the same, how far will the rock land from where it was thrown?

PLEASE EXPLAIN ALL STEPS AND WHY

Which of the following can change the frequency of a wave? a) interference b) the Doppler Effect c) diffraction d) all of the above

Derive equation Vb=M/m*sqrt2gRcm(1-cos)

An insulated beaker with negligible mass contains liquid water with a mass of 0.275 kg and a temperature of 65.9 ∘C. How much ice at a temperature of -18.7 ∘C must be dropped into the water so that the final temperature of the system will be 34.0 ∘C? Take the specific heat of liquid water to be 4190 J/kg⋅K, the specific heat of ice to be 2100 J/kg⋅K , and the heat of fusion for water to be 3.34×105 J/kg

Chapter 8 Problem 83: A thin hoop of negligible width is rolling on a horizontal surface at speed v when it reaches an incline of angle ?θ. (a) How far up the incline will it go before stopping? (1 point) (b) How long will it be on the incline before it arrives back at the bottom (total time going up and down)? (1 point) (c) The initial speed is 3.0 m/s and the angle is ?=15?θ=15o. Evaluate (a) and (b) numerically. (1 point)

Global Warming. Is it real, is it a threat, and who's to blame?

There are three issues here.

Is the Earth warming abnormally now, or is this current trend normal?

If the Earth is warming abnormally, is this a problem?

If the Earth is warming abnormally, can we attribute this to an overactive Sun, or to human activities.

This is a politically-charged issue. There is plenty of data, but the data can be interpreted in more than one way. The NASA Global Climate Web site (Links to an external site.)Links to an external site. provides factual data and different interpretations of the data. The differing interpretations are the problem. We can react. Should we?

What do you think? Do you see any compelling evidence one way or the other? Please support your position with logical statements, concrete examples, and citations of applicable. Please try to avoid political diatribes.

A billiard ball A moving at a speed of 2.4 m / s bumps into a billiard ball B of the same mass, which
are at rest. After the impact, A moves at a speed of 1.4 m / s in a direction that forms the angle 50 ◦
with A's original direction of movement. Determine the magnitude and direction of B's ​​velocity vector by
the impact. (Answer 1.8 m / s; 36 ◦)

You are using a rope to pull a 15 kg suitcase along a level path. There is friction between the suitcase and the floor, so you must pull with some difficulty to get the suitcase moving, needing a force of about 120N. Afterward, you find that by maintaining that force, the suitcase acceleration while sliding along the floor, the coefficient of static friction is 0.81and the coefficient of kinetic friction is 0.40.

a. Draw a force diagram and label all the forces on the suitcase for the static situation.

b. Draw a force diagram and label all the forces on the suitcase for the kinetic situation.

c. Explain the differences between your two force diagrams in part A and part B.

d. Find the acceleration that the suitcase experiences while you're dragging it across the floor.

e. How would your answer to part D change if you decided to add 5kg worth of items to the suitcase?

In a TV picture tube the accelerating voltage is 17.0 kV, and the electron beam passes through an aperture 0.40 mm in diameter to a screen 0.230 m away. What is the uncertainty in position of the point where the electrons strike the screen?

A 6.0-ft-tall girl stands on level ground. The sun is 23 ∘ above the horizon.

How long is her shadow?

Express your answer using two significant figures.

b) A 5.0-m-wide swimming pool is filled to the top. The bottom of the pool becomes completely shaded in the afternoon when the sun is 25 ∘above the horizon.

How deep is the pool?

Express your answer using two significant figures.

A 2.0-m-tall basketball player is standing on the floor a distance d from the basket, as shown in the figure below. He shoots the ball at an angle of 40.0o above the horizontal with a speed of 10.67 m/s and makes the shot. The height of the basket is 3.05 m. What is d

please make sure its detailed.

if density