Answer:
B. Sun was the center of the solar system.
Explanation:
Atomic number is defined as the total number of protons present in an element.
Each element of the periodic table has different atomic number because each of them have different number of protons.
For example, atomic number of Na is 11, and atomic number of Ca is 20.
On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.
For example, atomic mass of nitrogen is 14 that is, it contains 7 protons and 7 neutrons.
Thus, we can conclude that all atoms of the same element must have the same number of protons.
Answer: Protons
Explanation: The number of protons corresponds to the atomic number.
b. 0.50 kgm/s
c. 0.70 kgm/s
d. 3.5 kgm/s
Answer: The correct option is (c.).
Explanation:
Mass of the cart A= 1.5 kg
Velocity of Cart A = 1.4 m/s towards right
Mass of the cart B = 1.0 kg
Velocity of Cart B = 1.4 m/s towards left
Momentum (P)= Mass × Velocity
(Negative sign means velocity of the cart is in opposite direction of that of the cart A)
Total Momentum =
Hence, the correct option is (c.).
Its "biosphere and atmosphere" because photosynthesis comes from the plants and the atmosphere then consumes the carbon.
Answer:
1.40071 m/s
Explanation:
m = Mass of object = 100 g
v = Velocity of object
h = Height of drop = 10 cm
g = Acceleration due to gravity = 9.81 m/s²
Here, the loss of potential energy is equal to the gain in kinetic energy as energy is conserved
The speed of the object at the instant that the rod is horizontal is 1.40071 m/s
The cook needs to make 100 hamburgers. The price of 9 hamburgers is 2 pounds. Then 22.2 pounds are needed to bring 100 hamburgers.
There are simple mathematics to find the price of a material based on the data we have on it. For example if we know the price of one unit of that material then multiply the price by the number of units we want to buy.
If know the price of a bulk or certain number of materials, then find the price of one material from it.
Here, the price of 9 hamburgers is given 2 pound. Then, the price of one hamburger is :
2/9 = 0.22.
Now, multiply the value of one hamburger with the number that we want. We want 100 hamburgers. Then,
100× 0.22 = 22.2 pounds.
Therefore, 22.2 pounds are needed for 100 hamburgers.
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-moving pulleys are attached to the object and move with the object. Fixed-position pulleys are connected to a fixed point and do not move
-moving pulleys are easier to use than fixed position pulleys
-moving pulleys have more force than fixed-position pulleys