It's very difficult to determine how many calories are burned during any weight lifting activity because there are so many variables. It depends on how much you weigh, if you're using extra weight, how long it takes you to do 50 repetitions, and how long you rest between each rep. Also, weight lifting exercises like squats are not normally used to burn calories, because aerobic exercise is the best if you're concerned about how many calories you're burning.
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doing 50 jumping jacks will burn 5 calories
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You don't burn much, but certainly about a good 20 to 50 calories.
It depends on how long you want to take to lose the 50 pounds. To lose one solid pound fo weight, you must burn 3,500 more calories than you consume. That means, to lose 50 pounds, you must burn 175,000 more calories than you consume.
chores
Hard to answer this since the given values are way too specific. These kind of questions are really hard to measure with the calculators that are available. You can of course try this by buying a calorie calculator and doing the 50 squats.
The number of calories burned during 50 push-ups would depend on factors like age, gender, and intensity. However, on average, a person weighing 80 pounds may burn around 40-60 calories by doing 50 push-ups.
Around probably 3 runs if you do 2 sprints