The electric field that is 0.25m from a small sphere is 450n/c toward the sphere.

a. Is the charge positive or negative? Why?

b. What is the magnitude of the charge on the sphere?

A bird-watcher is hoping to add the white-throated sparrow to her "life list" of species. How far could she be from the bird described in example 14-8 and still be able to hear it? Assume no reflections or absorption of the sparrow's sound.

A student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student move the box?

A person standing on the surface of the earth has a weight of 650 N. What is its weight at a distance of two earth radii from the surface?

You have 750 g of water at 10°C in a large insulated beaker. How much boiling water at 100°C must you add to this beaker so that the final temperature of the mixture will be 75°C? For water, c = 4.19 x 103 J / (kg • K).

When does light refract? when it travels through gases when it crosses the boundary between two types of material Light refracts every 2000 wavelengths. when it travels through a vacuum

Determine the magnitude of the effective value of g⃗ at a latitude of 60 ∘ on the earth. assume the earth is a rotating sphere.

What characteristic of a planet determines the acceleration due to gravity on it?

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, position velocity, height height, velocity

You are operating a powerboat at night. You see green and white lights on another boat. What should you do?

How does Newton's second law apply to an "Egg Drop" experiment?