Subject: Science, asked 15 hours, 53 minutes ago

## A heater of a power rating 1,000 W is used 1 hour everyday for 20 days. Find the cost of the energy consumed by the heater if the charge per unit of energy is Rs 2? Hint:- 1 unit=1 kWh P=1000 W= 1 KW Time(t)= 1 x 20= 20 h

Subject: Science, asked 15 hours, 56 minutes ago

## An elevator weighing 1,000 kg is to be lifted up with a constant velocity of 0.10 m/s. What would be the power (in hp)delivered by the motor ?

Subject: Science, asked 1 week, 2 days ago

## The KE of a body moving with a speed of 10m/s is 30J. If its speed becomes 30m/s, its KE will be  a) 10 J b) 90 J  c) 180 J d) 270 J

Subject: Science, asked 1 week, 3 days ago

## work done when a force F=(i+2j+3k)N acting on a particle takes it from the point r1 = ( i+j+k) to the point r2= ( i - j + 2k) is

Subject: Science, asked 2 weeks ago

## What is the difference between Potential Energy and Elastic Potential Energy?

Subject: Science, asked 2 weeks ago

## A ball is revolving in a horizontal circle by attaching it to a string. the velocity of a ball changes continuously. it means acceleration exist. can we say the tension force in string does not work on ball because acceleration exist? Explain.

Subject: Science, asked 2 weeks, 2 days ago

## Derive the formula for power delivered to a body. Prove that instantaneous power delivered to a body is given by the product of force and velocity of the body

Subject: Science, asked 2 weeks, 2 days ago

## Dear experts and friends, I was just curious about something so I just wanted to ask a random question :) Why do we say that we should switch on the geyser and warm up the water before taking a shower and when going to take the shower, we should switch off the geyser immediately before going in the shower as we could get electrocuted? (sorry for making the question so long xD) but I just wanted to ask that why is it possible that we MIGHT get electrocuted by going into the shower with the geyser ON?  Hope to get an answer soon!

Subject: Science, asked 2 weeks, 3 days ago

## Sir there was a question in the work and energy's 1st class test.. And tht question was as follows: Which of the following statements about work done by a force is incorrect?: A) Work is done by a force only if the body moves towards the direction of the applied force. B) Work done by a body is equal to the amount of energy gained or spent by the body. C) Work done by a force can be 0 even if the object moves to a certain distance. D) Work done by a force can be positive as well as negative. Sir in this question the correct was (A) according to the test.. But it should be C ryt? coz work done by a force cannot be 0 even if the object moves to a certain distance!! So C is the incorrect option.. But i didn't understand that how Option A is the correct ans.. Pls explain!!

Subject: Science, asked 3 weeks, 4 days ago

## convert 1kw to corresponding to joule

Subject: Science, asked 3 weeks, 4 days ago

## what is the work done by gravity on a ball rolling on horizontal ball experts please answer

Subject: Science, asked 3 weeks, 4 days ago

## calculate potential energy of an object of mass 20 kg thrown vertically up ward at 200m

Subject: Science, asked 4 weeks, 1 day ago