How many types of quarks are there?
a. 2
b. 4
c. 6
d. 8

Answers

Answer 1

Answer: There are 6 types of quarks.

Answer: C. 6

Answer 2

Answer: The are 6 types of quarks: up, down, strange, charm, top, and bottom.
The answer:

C.6

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Someone please help on this one?
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What sometimes occurs when reclaimed water is used in agriculture?

Answers

I remember this from IPC! If farmers used reclaimed water, there is a chance of chemical contamination in the water can damage the plants, if not kill them entirely! :D

If you ride an elevator moving forward with a constant speed, is your apparent weight same,greater than or less than your weight?

Answers

If the elevator's speed is constant (in ANY direction) and you can't see out of it, then there's NO measurement you can make inside that will tell you that it's moving. Any weight you measure is normal.

In which situation can you be at rest and moving at the same time?When playing soccer, you are at rest relative to the ball and moving relative to the field.

When swimming, you are at rest relative to the water and moving relative to the sides of the pool.

When riding a bike, you are at rest relative to the bicycle and moving relative to the road

Answers

I think the answer is ( When riding a bike...)

I believe the last one about the bike is correct.

A kid on a playground swing makes 6 complete to-and-fro swings each 30 seconds

Answers

i assume that you want to find out what's the frequency is.

Number of oscillation = 6 which being done in 30 second.

which means the time period for 1 oscillation is 30 second/6 = 5 second

Frequency = 1/time period
= 1/5 Hertz

Hope this help

Suggest why signals to satellites are transmitted as slightly divergent beam and not as a parallel beam.

Answers

I can think of two reasons:

1). EVERY transmitted radio signal is transmitted as
a divergent beam. We don't have the technology to
transmit it as a perfectly parallel beam.
That's a good thing, because ...

2). If it were a perfect pencil-thin parallel beam, then
it would be practically impossible to keep it perfectly
aimed at the satellite.

Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south. Find the magnitude and direction of a) A + B and b) A - B. Specify the directions relative due west.