Physics, 13.03.2020 00:21 hayleedowney0143
The dominant form of drag experienced by vehicles (bikes, cars, planes, etc.) at operating speeds is called form drag. It increases quadratically with velocity (essentially because the amount of air you run into increases with v and so does the amount of force you must exert on each small volume of air). Thus Fdrag=CdAv2, where A is the cross-sectional area of the vehicle and Cd is called the coefficient of drag. Consider a vehicle moving with constant velocity v . Find the power dissipated by form drag.
A certain car has an engine that provides a maximum power P0. Suppose that the maximum speed of the car, v0, is limited by a drag force proportional to the square of the speed (as in the previous part). The car engine is now modified, so that the new power P1 is 10 percent greater than the original power (P1=110%P0).
Assume the following:
1. The top speed is limited by air drag.
2. The magnitude of the force of air drag at these speeds is proportional to the square of the speed.
3. By what percentage, (v1βv0)/v0, is the top speed of the car increased?
Answers: 2
Physics, 22.06.2019 00:20
Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle Ξ± with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamiltonβs equations (canonical equations) of motion.
Answers: 2
Physics, 22.06.2019 02:30
Which of the following are properties of mechanical waves? check all that apply βοΈ particles of the medium move back and fourth, but do not move with the wave. βοΈ the particles of the medium always move parallel to the wave motion. βοΈ wave motion begins with a disturbance in the medium. βοΈ waves transport energy from a source outward, away from the source.
Answers: 2
Physics, 22.06.2019 12:00
Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.
Answers: 1
The dominant form of drag experienced by vehicles (bikes, cars, planes, etc.) at operating speeds is...
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