Big Al stands on a skateboard at a rest and throws a 0.5-kilogram rock at a velocity of 10.0 m /sec. Big Al moves back at 0.05 m/sec. What is the combined mass of Big Al and the skateboard?
Answers
his and skateboard's combined mass is x
we know
F1=-F2
0.5kg*10m/s=-0.05m/s xkg
5=0.05x(minus cancel with the m/s as it represented the opposite direction of velocity and now there is no velocity in this equation.. so minus is avoidable. and the kgs cancel out)
x=10
so their combined mass is a 100 kg.. (I hope I didn't mess thing up for you)
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What is the approximate weight of a 20-kg cannonball on earth?
A current of 4A flows in a wire of resistance 60 ohm. calculate electrical energy consumed in 2 min.
Answers
Answer:
The angle of the launch is 17.09 degrees.
Explanation:
Given that,
The initial speed of a cannon is 100 m/s
It is launched at some angle and it lands after being in the air for 6 s.
We need to find the angle of the launch.
The time taken by the projectile to reach the ground is called the time of flight. It is given by the formula as follows :
Here, = launch angle
Hence, the angle of the launch is 17.09 degrees.
Answers
Answer:
True
Explanation:
So, if your mass on Earth is 45 kg on Earth, your mass will also be 45 kg on the moon. The reason behind this is because the amount of matter you're made of doesn't change if you're on the moon or on the Earth. The weight of an astronaut and his space suit on the Moon is only 250 N.
Final answer:
False. The weight of an astronaut plus her space suit on the moon is not only 255 N. The weight of an object on the moon is about one-sixth of its weight on Earth.
Explanation:
False. The weight of an astronaut plus her space suit on the moon is not only 255 N. The weight of an object is determined by the force of gravity acting on it. The moon's gravity is about one-sixth that of Earth's, so the weight of an object on the moon is about one-sixth of its weight on Earth. If the weight of an astronaut plus her space suit on Earth is known to be 255 N, then her weight on the moon would be approximately 42.5 N.
Learn more about Weight on the moon here:
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15 seconds
10 seconds
5 seconds
Answers
Answer: 10 seconds
A period is the time needed to complete one cycle. Period can be obtained by dividing the total time over the total number of waves.
T (period) = 60 secs / 6 waves
T = 10 secs
Answers
Answer:
it is a simple machine
Explanation:
Answers
A cation has a smaller radius than the atom.
Cations are positive ions that have lost an electron
B. Metals tend to have a negative valence and tend to be electron borrowers.
C. Nonmetallic elements tend to have a positive valence and tend to be electron borrowers.
D. The smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.
Answers
Answer: Option (D) is the correct answer.
Explanation:
According to the octet rule, in order to attain stability every atom requires to complete its octet by gaining or losing valence electrons.
The reactivity of an atom depends on the number of valence electrons. Smaller is the number of valence electrons to be gained or lose, the greater will be the activity of atom.
For example, atomic number of chlorine is 17 so, it just needs to gain one more electron to completely fill its shell. Whereas atomic number of aluminium is 13 so, it needs to lose 3 electrons in order to gain stability.
Thus, activity of chlorine atom will be more as compared to aluminium atom.
Thus, we can conclude that smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.
Answer: Option (D) is the correct answer.
Explanation:
Valence electrons are the electrons present in the outermost shell of an element.
For example, fluorine is a non-metal with atomic number 9. It contains 7 valence electrons and in order to attain stability it needs to gain only one electron.
Therefore, it is very reactive in nature. This also means that smaller is the electrons an atom needs to borrow or lend higher will be its reactivity.
Thus, we can conclude that the statement smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom, accurately describes properties of valence.