Acassegrain telescope

a. uses a concave mirror as its primary
b. has a hole in the center of its primary mirror
c. uses an eyepiece along the line of the objective

d. all of the above

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

Convection occurs when thermal energy is transferred by the movement of