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Spy balloon is to be constructed of a material with a mass of 0.5kg. it will be filled with helium and must be able to carry and instrument payload
A 270g metal block initially at 97°C is put into an 43g aluminum cup containing 195 g of water at 25°C. The specific heat of aluminum is 0.22 cal gl °CI.
On a frozen pond, a 10.6 kg sled is given a kick that imparts to it an initial speed of V(0) = 1.73 m/s.
A 276 kg piano slides 4.02 m down a 30.2° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline.
A simplified representation of the diesel cycle, with just air as the working substance. Show that the efficiency of the engine is:
Calculate the entropy change for each of the following:
A car can accelerate from rest to 25 m/sec in 12 seconds on a level road. The weight of the car is 10,000 newtons.
The initial speed of the skier is 6.6 m/s. After coasting a distance of 1.9 m up the slope, the speed of the skier is 4.4 m/s.
Compute the electric field, in both components and as magnitude and direction, at the midpoint between the two hanging masses.
Kyoto box is a simple solar oven used extensively in Africa. Assuming a square box with four reflectors of L = 75 cm, on a sunny day with direct sunlight
What minimum strength is needed for a line that is to stop a salmon of weight 85 N in 8.0 cm if the fish is initially drifting at 2.5 m/s?
What is the speed of the block just before it hits the spring? (Assume that friction is negligible.) (in m/s)
If the skier has a mass of 60kg and the force of friction retards his motion by doing 2500 j of work, what is his speed at the bottom of the slope?
The Maxwell-Boltzmann distribution of velocities v for a unit volume of an ideal gas can be written in the form
If the gravitational potential energy U of the rock-Earth system is zero at the bottom of the hill, what is the value of U just before the slide?
Assuming that the ball is always thrown at the same initial speed, at what angle should the outfielder throw the ball to make it go the same distance D.
A projectile is given a vertical upward velocity Vo = 10000 m/sec at Earth's surface. Neglect air friction.
A patient is to receive an intravenous injection of medication. In order to work properly, the pressure of fluid containing the medication.
Consider two spin systems A and A' placed in an external field H. System A consist of N weakly interacting localized particles of spin 1/2 and magntic moment u
If 3.75 X 10^-4 J of work are required to move 13.7 microc of charge from one point to another, what is the electric potentail difference the two points.
Consider a system of two Einstein solids, A and B, each containing 10 oscillators, sharing a total of 20 units of energy.
Designing a roler coaster is very tricky. Patrons of theme and amusement parks want to be thrilled , but generally do not want to be injured.
Say you saw the following interference pattern due to air between two glass slides:
A skier is pulled by a tow rope up a frictionless ski slope that makes an angel of 12 degree with the horizontal. The rope moves parallel to the slope.
A ball is launched with initial speed v from ground level up a frictionless slope. The slope makes an angle theta with the horizontal.