Physics, 13.02.2020 02:01 emmajobaby

A bullet is fired from a rifle that is held 1.66 m above the ground in a horizontal position. The initial speed of the bullet is 1059 m/s. Calculate the time it takes for the bullet to strike the ground.

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Answer from: addisonrausch

Therefore, the time it takes for the bullet to strike the ground is 0.582 seconds

Explanation:

h = ut + 0.5(gt²)

where;

h is the height above ground = 1.66 m

u is the initial velocity of the bullet vertically = 0

g is the acceleration due to gravity = 9.8 m/s²

From the equation above

1.66 = 0*t + 0.5*9.8*t²

1.66 = 4.9t²

t² = 1.66/4.9 = 0.3388

t = √0.3388

t = 0.582 seconds

Therefore, the time it takes for the bullet to strike the ground is 0.582 seconds

Answer from: Quest

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

Answer from: Quest

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic = - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

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A bullet is fired from a rifle that is held 1.66 m above the ground in a horizontal position. The in...