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What is the density of air at 20 degree Celsius and atmospheric pressure?

1.29 is density at STP so density at 20*C is 1.29 x273/293 Pankaj shah,India

Physics+Pendulum=Headache

At the low point in its swing, a pendulum bob with a mass of 0.9 kg has a velocity of 8 m/s. The kinetic energy is of course 29 J. But now.... (b) Ignoring air resistance, how high will the bob swi

A daredevil jumps a canyon 13 m wide. To do so, he drives a car up a 13 ◦ incline.

What minimum speed must he achieve to clear the canyon? The acceleration of gravity is 9.81 m/s^2. Answer in units of m/s If the daredevil jumps at this minimum speed, what will his speed be when he

In a film camera ...

when the light is bent at the lens and turned upside down what turns the image upright-Nothing does. When you get the film developed, you turn it around in your hand.

Physics Question: Force, Power, and Incline

A 2402 kg block of granite is pulled up an incline that has an angle of inclination of 25.0 o with a constant speed of 1.10 m/s by a steam winch. The coefficient of kinetic friction between the block

PLEASE HELP! A parachutist descending at a speed of 11.80 m/s loses a shoe at an altitude of 50.3m

A parachutist descending at a speed of 11.80 m/s loses a shoe at an altitude of 50.30 m. When does the shoe reach the ground?-To avoid solving quadratic equation first find the fianl vleocity as it re

Can real science be drawn from science fiction

Are there any examples?-Sure, the 6 million Dollar Man, an old TV series, had a half human, half machine cybernetic hero.Today, much of the prostheses used to replace arms and legs are resembling the

Plz Help.....A planet of mass m is moving around a star of mass M and radius R in a circular orbit.....

A planet of mass m is moving around a star of mass M and radius R in a circular orbit of radius r. The star abruptly shrinks to half its radius without any loss of mass. What change will be there in t

Logic Gates: NOT gate question

For example, if I were to place a single input, two NOT gates and an output in series, how is electricity generated in the middle of the two NOT gates? Or, more generally, if an input is off, where do

Physics help! Calculate the hang time of an athlete who jumps a vertical distance of 0.76 meter.

Calculate the hang time of an athlete who jumps a vertical distance of 0.76 meter. what would i use as equation-do it the opposite way, how long does an object take to fall from that height, then dou

Physics problem: A small first-aid kit is dropped by a rock climber who is descending steadily at 1.4 m/s.

After the 2.3 s, how far is the kit below the climber?-distance between kit and climber y = -.5gt^2 at t = 2.3 s, y = -.5*9.8*2.3^2 = - 25.9 m 25.9 m below the climber

Physics! A rocket moves upward, starting from rest with an acceleration of 31.8 m/s2 for 3.58 s.

A rocket moves upward, starting from rest with an acceleration of 31.8 m/s2 for 3.58 s. It runs out of fuel at the end of the 3.58 s but does not stop. How high does it rise above the ground?-first we

Identify a variety of energy transformations in everyday devices involving electrical, sound, light and heat

THE LAST WORD WAS energy-Microphone mechanical to electrical energy, Light from a light bulb and heat is the by product. Sound from electrical waves passing through a speaker.-TV = Electrical Current

I don't know how to solve this problem

a ball is kicked at an angle of 50 degrees at a speed of 25m/s. when it passes a 3m tall bar 30m away will it be above or below the bar? are these variables right? if not what are they? x: d=30m di=0m

Physics Problem: High School level dealing with acceleration

A light plane must reach a speed of 30 m/s for takeoff. How long must the runway be if the (constant) acceleration is 3.0 m/s^2? What formula/s will help me solve the problem?-(v^2/2a) = 150 metres.-I
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