Answer:
a) a = 3.29 m/s²
b) a = 3.51 m/s²
Explanation:
mass of dogs = 19 kg
loaded sled mass = 210 Kg
a)writing all the forces in x direction
a = 3.29 m/s²
b) acceleration when sled start to move the friction will now be acting will be kinetic friction.
a = 3.51 m/s²
To produce a single sugar molecule a plant must use a molecule of water (H2O) and carbon dioxide (CO2) and sunlight. To get 4 molecules, you simple use 4 molecules of water and 4 molecules of carbon dioxide.
No problem! :D
Explanation:
Distance = (intial speed)X(Time) + 1/2(acceleration)X(Time) [Third equation of motion]
As initial speed is zero, therefore;
Distance = 1/2(acceleration)X(Time)
= 1/2 (6 X 15)
= 1/2 (90)
= 45 meters
Hence, the object traveled 45 meters.
Answer:
The value of 
and R are 12.9 ohm and 2.6 V.
Explanation:
Given that,
Potential difference = 22.0 V
Current = 1.50 A
If this potential difference is reversed,
Then the current = 1.90 A
In forward direction
The net emf is
The net current is
...(I)
In reverse direction
...(II)
From equation (I) and (II)
Hence, The value of and R are 12.9 ohm and 2.6 V.
Answer:
B) AU is increased by 3,000,000 miles every 15 years
Explanation:
Statement B is wrong because the AU (Astronomical Unit, which is defined as the distance between the centre of the Sun and the centre of the Earth) is approximately constant.
To be more precise, the distance between the Earth and the Sun increases approximately by 15 cm every year. This means that after 15 years, the AU will be increased by
15 cm x 15 = 225 cm = 2.25 m
Which is totally different from 3,000,000 miles of statement B. Therefore, this statement is wrong.
