Majiri

This page lists questions and answers that were posted by visitors named Majiri.

Questions

The following questions were asked by visitors named Majiri.

How many moles of oxygen are produced when 20 moles decomposed?

Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²

What is the acceleration due to gravity 'g' on the moon if 'g' is 10m/s² on the earth?

What is the efficiency of a crane that used current of 8A at 150V to raise 450kg load at the rate of every minutes?

A jack has a lever arm of 45cm and pitch of 0.5cm. If it's efficiency is 30%,what force is required to lift a load W of mass 1200kg

The unstretched length of a piece of elastic rubber is 5cm a force of 9N is required to stretch if by 1cm.what amount of work will be done to stretch the rubber from a length of 12cm to 8cm if the rubber remained within the elastic limit?

An electric lamp has the following markings 230V. 250W, How long would it take the lamp to use one kilowatt-hour when connected to a 230V mains?

An object weighs 100N on the earth's surface. Find its weight at a point P with orbital radius 2R. [g = 10NKg-1

A radioactive sample initially contains N- atoms. After three half lives the number of atoms that disintegrated is ?

The sum of three numbers in base two is 11101. If the first two numbers are 1011 and 1101 find the third number?

A block and tackle system is used to lift a load of 20X through a vertical height of 10.5m. If the efficiency of the system is 40%, how much work is done against friction?

A ball is thrown upward with speed 12m/s from the top of a building. How much later must a second ball be dropped. From the same starting point if it is to hit the ground at the same time as the first ball? The initial position is 24m above the ground

If the house on a particular stretch of road are all the old numbers starting at 11, how many houses are there if the total all the numbers is 551?

A ball shot at an angle of 60° to the ground strikes a building 23m away at a point 16m high. Find the magnitude and direction of the final velocity of the ball as it strikes the wall.

Answers

The following answers were posted by visitors named Majiri.

Can you please drop the formula. Quite confuse.

U=30m/s² V= 0 V = u -gt 0 = 30 - 10t t=3s

x + y + z = 126.... equ 1 x = z/2 y = 3z/4 Put x,y into equ 1 z/2 + 3z/4 + z = 126 ( 2z + 3z + 4z )/4 = 126 9z/4 =126/1 z = 56 x = 56/2 = 28 Y = 3*56/4=3*14 = 42 56 + 28 + 42 = 126

Using the formula a= (m2-m1)g/(m1+m2) a= -0.26 For tension T = (2m2m1)g/(m2+m1) =13.33N

No he is not. If you subtract two from the left hand side you get -4. So to solve the equation you add 2 to both sides