Physics, 18.10.2019 07:00 MoparorNocar061401

Aworker drops a wrench from the top of a tower 80m tall. what is the velocity when the
wrench strikes the ground?

Answers: 1

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Answers

Answer from: kayleep3947

The velocity of the wrench is 39.6 m/s.

Explanation:

Given that,

Height of tower = 80 m

We need to calculate the velocity of the wrench when the wrench strikes the ground

Using the third kinematics equation

v^2=u^2+2gs

Where,

v = final velocity

u = initial velocity

g = acceleration due to gravity

s = traveling distance

Put the value into the formula

$v^2=0+2\times9.8\times80$

$v=\sqrt(2\times9.8\times80)$

v=39.6 m/s

Hence, The velocity of the wrench is 39.6 m/s.

Reference :

link

Answer from: fperez616

39.6 m/s

Explanation:

Taking down to be positive:

Given:

v₀ = 0 m/s

a = 9.8 m/s²

Δy = 80 m

Find: v

v² = v₀² + 2aΔy

v² = (0 m/s)² + 2 (9.8 m/s²) (80 m)

v = 39.6 m/s

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

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

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Aworker drops a wrench from the top of a tower 80m tall. what is the velocity when the
wrench s...