Question

The two basic types of optical telescopes are ?

A.infrared telescopes and X-ray telescopes.
B.refracting telescopes and reflecting telescopes.
C.reflecting telescopes and infrared telescopes.
D.X-ray telescopes and radio telescopes.

Answer 1

@sachine94

Answer 2

Its B

Answer 3

b.refracting telescopes and reflecting telescopes

Answer 4

@sachine94 .
If Jan takes exactly 25 minutes to walk to school each day, and her school is 2 miles away, what is her average walking speed?

A.50 miles per min
B.1.08 miles per min
C.12.5 miles per min
D.0.08 miles per min

Answer 5

@sachine94 , any ideas for that question ^ ?

Answer 6

i sec

Answer 7

ok ..

Answer 8

average speed =total distanc/time taken
2/25=0.08milesper minuite

Answer 9

Thanks ..
Which of the following describes inertia?

A.Objects in motion will stay in motion and objects at rest will begin moving unless the objects are acted on by an outside force.

B.Objects in motion will slow down and objects at rest will stay at rest unless the objects are acted on by an outside force.

C.Objects in motion will stay in motion and objects at rest will stay at rest unless the objects are acted on by an outside force.

D.Objects in motion will speed up and objects at rest will stay at rest unless the objects are acted on by an outside force.

Answer 10

c.as inertia is property of an object by virtue of which it tends to resist the state of rest or continue to be in state of motion unless an external unbalanced force is applied

Answer 11

Which characteristic would best help to identify a sample of lazurite from among the other minerals in the table?

A.crystal system
B.streak
C.specific gravity
D.hardness

Answer 12

i dont know sorry

Answer 13

Its okay :)

Answer 14

lazurite do have a refractive index of 1.50 so u could ditingush it with that