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You wish to observe the progress of your vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that sound waves do not travel in a vacuum. So you place a mercury barometer inside the bell jar and follow the height of the mercury column as the pump chugs away. When you observe a height of 5.77 mm, what fraction of atmospheric pressure, expressed as a percentage, have you achieved in your bell jar? The density of mercury is 1.36 × 104 kg/m3 and standard atmospheric pressure is 1.01 × 105 Pa.
A curve of radius 35 m is banked for a design speed of 64 km/h. If the coefficient of static friction is 0.34 (wet pavement), at what range of speeds can a car safely make curve.
A 2.25×10^4 elevator is to be accelerated upward by connecting it to a counterweight using a light (but strong!) cable passing over a solid uniform disk-shaped pulley. There is no appreciable friction at the axle of the pulley, other than its mass..
A 60 g bullet traveling at 230 m/s penetrates a block of ice at 0°C and comes to rest within the ice. suppose that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the collision.
What is an average speed of the runner
The moon in its orbital about the earth has a centripetal acceleration about 1/4200 of that an object dropped on Earth's surface. If the moon were twice as far away what would its centripetal acceleration be?
The centripetal and tangential accelerations are equal
In which scenario do you experience the larges acceleration? Explain why using physical principles you have learned.
A jet plane lands with a speed of 98 m/s and can accelerate at a maximum rate of 5.90 m/s2 as it comes to rest. (a) From the instant the plane touches the runway.
Classical Mechanics: Projectile Motion, A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.80 m/s at an angle of 21.0° below the horizontal. It strikes the ground 3.00 s later.
Each of two small spheres is positively charged; the combined charge totals 60.0 nC. A.) What is the charge on each sphere if the spheres are repelled with a force of magnitude 0.270mN when placed 0.100m apart?
Find out the frequency of the fourth harmonic if the string is fixed at one end and free at other. (That is, if the free end is attached to a long string of negligible mass.)
The total electric flux from a cubical box 40.0cm on a side is 2280 Nm^(2)/C. What charge is enclosed by the box?
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