Recent content by ashvuck101

Homework Statement To an order of magnitude, how many helium-filled toy balloons would be required to lift you off the ground? Helium is an irreplaceable resource so develop a theoretical answer rather than an experimental one. Homework Equations ? The Attempt at a Solution...

Homework Statement A scientist wants to put an 100kg experimental package in orbit around the Earth. The cost of deployment depends on the amount of extra energy it takes to get it into the required position i.e. how much more energy is used than just sending the rocket up there. a)...

ok i did that and got -0.703125 as acceleration then i got a force of -8437.5 N so the craft needs a downward force of 8437.5N to come to 0 m/s? is it downward or upward??

ok...but i can't calculate an upward force without, Acceleration I am only given constant velocity?? which means there is no acceleration

Homework Statement A simple pendulum, 2.0 m in length, is released from rest when the support string is at an angle of 25° from the vertical. What is the speed of the suspended mass at the bottom of the swing? Homework Equations R2= X2 + Y2 The Attempt at a Solution I know the...

Homework Statement A landing craft of mass 12,000 kg prepares itself for a Moon landing. When at a vertical distance 160m above the Moon’s surface it’s downwards velocity is 15 m/s. A retrorocket is fired to give the craft an upward thrust to slow its speed to zero as it meets the...

could it be .4x=(Joules calulated)?

er could you put that to me algerbarically please... i mean it makes sense if it was 50% all you do is double it

Homework Statement An M gram chunk of hot iron is placed on a large piece of 0 ºC ice, causing m grams of ice to melt. a. What will be the final temperature of the system? b. What must have been the initial temperature of the hot iron? c. What must have been the initial temperature of...

what so how am i meant to calulate the other 60% that's not possible?

does 47.6sec sound right?

Homework Statement 6. Cameron burns a 0.5g peanut beneath 75g of water, which increases in temperature from 22 ºC to 40 ºC a. Assuming 40% efficiency, what is the food value, in J, of the peanut? b. What is the food value in J per gram? Homework Equations q=mCt The Attempt at a...

so did you get 0.0476 sec or did i do something wrong

ok if two cars are going in any direction not matter what directiion as long as they are not the same then one speed is negative

i have drawn a picture and i know they don't crash head on but i don't see how you can predict the final directions there only way i know how to work out which direction they going is when you know which car as more force? Is equation i am using right? if so how come there is not enough data...