An example of an indicator species is the sea otter. Without sea otters, sea urchins would overgraze on kelp beds, dramatically changing the marine community.

True

False

This is the solid outermost layer of the Earth, including the crust and upper-mantle.

How does the force of gravity between two bodies change when the distance between them doubles? 1. unable to determine; the mass is needed. 2. doubles 3. halves 4. quadruples 5. remains the same 6. drops to one quarter of its original value?

A pump lifts water from a lake to a large tank 20 m above the lake. How much work against gravity does the pump do as it transfers 5.0 m^3 if the density is?=1000kg/m^3?

How much force must you apply to give the go cart an acceleration of 0.9m/s^2

One carpenter builds 1/5 of a house in 3/4 of a day and the other builds 2/5 of a house in the same amount of time. How many houses do the two carpenters build in total per day?

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?