NEET · Physics · STD 11 - 5. work,energy,power and collision
The power of a crane, which lifts a mass of 1000 kg to a height of 20 m in 10 s is :
\(\left(g=9.8 m / s ^2\right)\)
- A 19.6 W
- B 39.2 W
- C 19.6 kW
- D 39.2 kW
Answer & Solution
Correct Answer
(C) 19.6 kW
Step-by-step Solution
Detailed explanation
(C) 19.6 kW
Given \(m=1000 kg, h=20 m, t=10 s, g=9.8 m / s ^2\).
Work done by the crane is \(W=m g h\).
\(W=1000 \times 9.8 \times 20=196000 J\)
Power is the rate of doing work, \(P=\frac{W}{t}\).
\(P=\frac{196000}{10}=19600 W\)
\(P=19.6 kW .\)
Given \(m=1000 kg, h=20 m, t=10 s, g=9.8 m / s ^2\).
Work done by the crane is \(W=m g h\).
\(W=1000 \times 9.8 \times 20=196000 J\)
Power is the rate of doing work, \(P=\frac{W}{t}\).
\(P=\frac{196000}{10}=19600 W\)
\(P=19.6 kW .\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A series LCR circuit with inductance \(10\,H\), capacitance \(10\,\mu F\), resistance \(50\,\Omega\) is connected to an ac source of voltage, \(V=200 \sin (100 t)\) volt. If the resonant frequency of the LCR circuit is \(\nu_{0}\) and the frequency of the ac source is \(v\), then:NEET 2022 Medium
- The minimum wavelength of \(X\)-rays produced by an electron accelerated through a potential difference of \(V_{\text {volts }}\) is proportional to :NEET 2023 Easy
- A solid cylinder of mass \(2\; kg\) and radius \(4 \;\mathrm{cm}\) is rotating about its axis at the rate of \(3\; \mathrm{rpm}\). The torque required to stop after \(2 \pi\) revolutions isNEET 2019 Hard
- In the circuit shown in the figure, the input voltage \(V_i\) is \(20\,\, V, \,\,V_{BE} = 0 \) and \(V_{CE}= 0.\) The values of \(I_B\,,\,I_c\) and \(\beta\) are given by
NEET 2018 Hard - Match \(List - I\) with \(List - II\) Choose the correct answer from the options given below
NEET 2022 Medium - The work functions of Caesium \((Cs)\),Potassium \((K)\) and Sodium \((Na)\) are \(2.14\,eV,2.30\,eV\) and \(2.75\,eV\) respectively. If incident electromagnetic radiation has an incident energy of \(2.20\, eV\), which of these photosensitive surfaces may emit photoelectrons?NEET 2023 Medium
More PYQs from NEET
- Of the following \(0.10\, m\) aqueous solutions, which one will exhibit the largest freezing point depression ?NEET 2014 Easy
- The addition of a catalyst during a chemical reaction alters which of the following quantities?NEET 2016 Medium
- A full wave rectifier circuit consists of two \(p-n\) junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?NEET 2023 Easy
- A piece of ice falls from a height \(h\) so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of \(h\) is [Latent heat of ice is \(3.4 \times 10^{5}\; J / k g\) and \(g=10\; N / kg ]\)NEET 2016 Hard
- The \(\mathrm{p} \mathrm{K}_{\mathrm{b}}\) of dimethylamine and \(\mathrm{pK}_{\mathrm{a}}\) of acetic acid are \(3.27\) and \(4.77\) respectively at \(\mathrm{T}(\mathrm{K})\). The correct option for the \(pH\) of dimethylammonium acetate solution is :NEET 2021 Medium
- The current \(I\) in the circuit shown below is :
(All diodes are ideal and identical)
NEET 2026 Easy