Answer:
Velocity= Distance divided by time divided by degree or direction.
Explanation:
Speed=DIstance divided by time
The expression for the bullet's speed vbullet is and the speed of a 9.0 g bullet is v=16.8 m/s
A bullet of mass m is fired into a block of mass m that is at rest. the block, with the bullet embedded, slides distance d across a horizontal surface. the coefficient of kinetic friction is μk.
The initial kinetic energy of the bullet is given by
where
m is the mass of the bullet
v is the initial speed of the bullet
The expression for the bullet's speed vbullet is
where
is the coefficient of kinetic friction
g is the acceleration of gravity
The work done by the force of friction is
where d is the displacement of the block+bullet.
Because the final kinetic energy is zero (the bullet with the block comes at rest), we can write:
And so
By solving for v, the solution for the bullet speed:
The speed of a 9.0 g bullet that, when fired into a 12 kg stationary wood block causes the block to slide 5.4 cm across a wood table. Assume that k=0.20.
We have:
the mass of the bullet, m = 9.0 g = 0.009 kg
the mass of the block, M = 12 kg
the distance covered by the block+bullet, d = 5.4 cm = 0.054 m
the coefficient of friction,
the acceleration of gravity,
By substituting, we got
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b. Kepler.
c. Copernicus.
d. Newton.
B. Both atoms will have the same number of protons.
C. Both atoms will have the same number of neutrons.
D. Cobalt has one less proton.
Answer:
Cobalt has one less proton.
Explanation:
Nickel and Cobalt both has almost same atomic mass number approximately 59 but has different atomic number.
Number of proton and electrons in an atom is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Case 1: Cobalt
Atomic mass number = 59
Atomic number = 27
Number of proton and electrons in Nickel is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of proton = 27
Number of proton = 27
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Number of neutrons = 59 - 27
Number of neutrons = 32
Case 2: Nickel
Atomic mass number = 59
Atomic number = 28
Number of proton and electrons in Nickel is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of proton = 28
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Number of neutrons = 59 - 28
Number of neutrons = 31
Cobalt has one less proton.
Thus, Option D is correct.
Answer: The correct answer is option D.
Explanation:
Cobalt and Nickel both are transition metals which means that their last electron enter d-orbitals.
These two elements have similar atomic masses but differ in the atomic number.
Atomic number is equal to the number of protons or electrons present in that element.
Atomic number = number of protons = number of electrons
Atomic Mass is the sum of protons and neutrons in an element
Atomic mass = Number of protons + Number of neutrons
Atomic Number = 27
Number of protons = 27
Atomic mass = 59
Number of neutrons = 59 - 27 = 32
Hence, Number of protons in this element is 27 and number of neutrons are 32.
Atomic Number = 28
Number of protons = 28
Atomic mass = 59
Number of neutrons = 59 - 28 = 31
Hence, Number of protons in this element is 28 and number of neutrons are 31.
Hence, the correct answer is option D.