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mihalych1998 [28]
4 years ago
8

A student planted bean seeds in two cups and placed the cups on a sunny windowsill. One cup was given 10 mL of water and the oth

er cup was given no water. What are two things that should be kept constant in this experiment?
Physics
1 answer:
Fed [463]4 years ago
7 0

Answer: The water and sun.  

   Please hit that brainlist button and hoped it helped you out.

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Predict the gravitational force between two 15-kg balls whose centers are 35 m apart.
ArbitrLikvidat [17]

F=G\frac{m_1-m_2}{r^2}

=\frac{(6.67\times10^{-11}N*m/kg^2)(15kg) }{(0.35m)^2}

=1.2\times10^{-7} N

Because the weight of one ball is mg = 147 N, the gravitational force between the two balls is 1.2\times10^{-7}N or 8.4*10^3 parts per billion of the  weight.

5 0
2 years ago
A straight wire of length 0.53 m carries a conventional current of 0.2 amperes. What is the magnitude of the magnetic field made
olga55 [171]

Explanation:

It is given that,

Length of wire, l = 0.53 m

Current, I = 0.2 A

(1.) Approximate formula:

We need to find the magnitude of the magnetic field made by the current at a location 2.0 cm from the wire, r = 2 cm = 0.02 m

The formula for magnetic field at some distance from the wire is given by :

B=\dfrac{\mu_oI}{2\pi r}

B=\dfrac{4\pi \times 10^{-7}\times 0.2\ A}{2\pi \times 0.02\ m}

B = 0.000002 T

B=10^{-5}\ T

(2) Exact formula:

B=\dfrac{\mu_oI}{2\pi r}\dfrac{l}{\sqrt{l^2+4r^2} }

B=\dfrac{\mu_o\times 0.2\ A}{2\pi \times 0.02\ m}\times \dfrac{0.53\ m}{\sqrt{(0.53\ m)^2+4(0.02\ m)^2} }

B = 0.00000199 T

or

B = 0.000002 T

Hence, this is the required solution.

4 0
4 years ago
How is energy sent from Earth to space?
Nostrana [21]
It might be radiation and reflection but I’m not sure
8 0
3 years ago
Read 2 more answers
An object is moving east, and its velocity changes from 66 mvs to 26 mvs in 10 seconds. Which describes the
STALIN [3.7K]

Answer:

negative acceleration of 4m/s²

Explanation:

Given parameters:

Initial velocity  = 66m/s

Final velocity = 26m/s

Time taken = 10s

Unknown:

Description of the acceleration  = ?

Solution:

Acceleration is the rate of change of velocity with time.

It is mathematically expressed as;

    acceleration  = \frac{v - u}{t}

v is the final velocity

u is the initial velocity

t is the time taken

  Now insert the parameters and solve;

    Acceleration  = \frac{26 - 66}{10}   = -4m/s²

So, we see a negative acceleration of 4m/s²

6 0
3 years ago
Proxima Centauri and the Sun are both main-sequence stars, but Proxima Centauri is a red dwarf and the Sun is a yellow dwarf. Ba
shutvik [7]

Answer:

Yellow dwarfs are small, main sequence stars. The Sun is a yellow dwarf. A red dwarf is a small, cool, very faint, main sequence star whose surface temperature is under about 4,000 K. Red dwarfs are the most common type of star. Proxima Centauri is a red dwarf.

Explanation:

6 0
3 years ago
Read 2 more answers
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