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Find the currents and voltages in the circuit shown in Fig. 2.28.
- What is the power of a 50kg woman in climbing a hill 500m high?
- How long will a 42kg girl with an average power of 30watts run up a staircase to the second floor of a building 6m high?
- A sack of cement with a mass of 120kg is lifted by a construction worker in 15m from the ground. Compute the amount of work done by the construction worker and his power after accomplishing the work in 30 minutes?
Motion along a frictionless inclined plane
A 64.0 kg person is riding an elevator as shown in the figure above. The elevator is accelerating upwards at a rate of 0.682 m s−2.
For this problem use g = 9.81 m s−2
What is the magnitude of the normal force, the force on the person from the elevator? (in N to 3.s.f)
1. Calculate the kinetic energy and momentum of a proton traveling 2.90 𝑥 108 𝑚/𝑠.
1. A box at rest has the shape of a cube 2.6 m on a side. This box is loaded onto the flat floor of a spaceship and the spaceship then flies past us with a horizontal speed of 0.80c. What is the volume of the box as we observe it?
1. What is the momentum of a proton traveling at 𝑣 = 0.68𝑐?
1. A certain type of elementary particle travels at a speed of 2.70 𝑥 108 𝑚/𝑠. At this speed, the average lifetime is measured to be 4.76 𝑥 10−6 𝑠. What is the particle’s lifetime at rest?
The heat from the sun travels to the earth through the process of?
The resistance of a resistance thermometer at the ice point is 40 Ω. Its resistance at temperatures T1 and T2 are 48 Ω and 53.2 Ω respectively. What is the ratio of T2 and T1?
