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An elevator with a mass of 2500 kg rests at 10m above the base of an elevator. It is raised to 100m above the base. The elevator falls freely to the base and strikes a strong spring. Find the potential energy of the elevator, (g = 9.8 ms-2).
Mr. John is conducting elevator experiments. Bobby stands on a weigh scale and reads the scale while ascending and descending the building. Bobby’s mass is 80 kg. He notices that the scale readings depend on what the elevator is doing. Angular velocity of hour hand watch is double than that of Earth’s rotation. What is the scale reading when John accelerates upward at 0.40 m/s2?
A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be
A person stands on a scale in an elevator. He notices that the scale reading is less than his usual weight. Which of the following could possibly describe the motion of the elevator?
An elevator can carry maximum of 16 passengers with an average weight of 80 kg. However, four boys more than the maximum carrying capacity of the elevator entered it making the average weight as 86 kg and overloading the elevator. What is the average weight of those four boys ?
A person who weighs 800 N steps onto a scale that is on the floor of an elevator car. If the elevator accelerates upward at a rate of 5 m/s2, what will the scale read?
If X stands for addition, V stands for substraction, U stands for 'equal to',  ∧ stands for division, ∑ stands for multiplication, O stands for greater than and σ stands for less than. State which expression is true?
If "x" stands for addition, "<" stands for subtraction, " + " stands for division, ">" stands for multiplication, " – " stands for equals to, "÷" stands for greater than and " = " stands for less than, which of the following holds true?
If '+' stands for '÷', '­' stands for '=', 'x' stands for '+', '÷'stands for greater than, '=' stands for less than, '>' stands for multiplication and '<' stands forsubtraction, then which of the following alternatives is correct?
If "x" stands for addition, "<" stands for subtraction, "+" stands for division, ">" stands for multiplication, "–" stands for equals to, "÷" stands for greaterthan and "=" stands for less than, which of the following holds true?