Physics, 29.10.2020 18:30 tonhill6923

What is the efficiency when 120j is supplied to a toaster and 50J of energy is transferred into heat?

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Answer from: ambinicole66

When 120J is supplied to a toaster and 50J of energy is transferred into heat, the efficiency of the toaster is 42%.

Given the following data:

Energy input = 120 Joules Energy output = 50 Joules

To find the efficiency of the toaster:

Mathematically, the efficiency of an engine is calculated by using the formula:

$Efficiency = \frac{E_o}{E_i} \times 100$

Where:

Eo is the energy output. Ei is the energy input.

Substituting the given parameters into the formula, we have;

$Efficiency = \frac{50}{120} \times 100\\\\Efficiency = 0.42 \times 100$

Efficiency = 42%

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Answer from: Kling1982

η = 58.3%

Explanation:

It has a total of 120 [J], and part of this energy is lost in Heat 50 [J], that is to say of those 120 [J] 120 - 50 = 70 [J] are used to prepare food.

Efficiency is characterized by being equal to the work done on the investment made.

Therefore the efficiency (η) is:

η = 70/120

η = 58.3%

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.