Misc problems dealing with units conversions, volume, density velocity and distance.

A corner construction lot has the shape of a right triangle. If the two sides perpendicular to each other are 37 m long and 42.3 m long, respectively, what is the length of the hypotenuse? 75. The lightest solid material is silica aerogel, which has a typical density of only about 3 0.10 g/cm . The mole ...continues

Wave equation - movement of ring on the string

We put a small ring of mass m on the long (infinite) string. The ring slides without friction. How does the ring move, when we send by a string the sine wave? (I need mathematical equation of moving.) How does the wave scatter on the ring? (I need the amplitude of scattering waves, or reflection coefficient R). I need mathema ...continues

Please, show me how you got the answers and give me the answers. Thanks

1. A charge of 1020 C was passed through a wire in 5.5 min. What was the average electric current during that interval? 2. How long does it take for 67 C to pass a given point in a wire that carries an electric current of 0.80 A? 3. What is the potential difference across a 220 ohm resistor when a current of 3.50 A flow th ...continues

Classical mechanics problems - vectors operations and uniform acceleration

13. A bus travels at an average speed of 90 km/h. On average, how far does the bus travel in 20 min? Is this distance the magnitude of the actual displacement of the bus? Explain. 17. A student runs 30 m east, 40 m north, and 50 m west. (a) The magnitude of the student’s net displacement is (1) between 0 and 20 m, (2) bet ...continues

Relativity

At standard Temperature and pressure sound travels at speed u=330m/s relative to the air through which it propagates. Four students A,B,C and D position themselves as shown if figure 1.20 (see attachment), with A,B,C in a straight line and D vertically above B. A steady wind is blowing with speed 30m/s along the line ABC. If ...continues

Relativity (Conservation of Momentum and COM Reference Frame; Length and Time Contraction)

1. Conservation of Momentum and COM reference frame: Two particles are sliding directly towards each other on a frictionless surface. According to an observer in the laboratory reference frame, a 3.00kg particle moves to the right at 10.00m/s and a 5.00kg particle moves towards the left at 2.00m/s. After the head-on collision, t ...continues

Please, show me how you got the answers and give me the answers. Thanks

1. A 100 ohm resistor is joined in parallel with a 47 ohm resistor. What is the equivalent resistance? 2. Three capacitors of 2.0, 5.0, and 20 microF are joing together in parallel. What is their equaivalent capacitance? 3. Three capacitors of 1.0, 1.5, and 5.0 uF are joined together in series. What is their equivalent cap ...continues

Physics Problems (Displacement Vectors; Velocities etc.)

I would like you to show me all of your work/calculations and the correct answer to each problem. 13. A ball rolls at a constant velocity of 1.50 m / s at an angle of 45 degrees below the + x-axis in the fourth quadrant. If we take the ball to be at the origin at t = 0, what are its coordinates (x, y) 1.65 s later? Answers ...continues

Resistance, Voltage

1. Find the resistance of the network figure 1 2. Calculate the voltage across the 20 uF capacitor in the circuit of the figure 2. The battery voltage is 9.0 V. 3. 8. (a)Find the terminal potential difference of the battery in the figure 3 , given that the internal resistance r is 375 Ohms and the load resistance RL is 15 ...continues

Vector Sum

5.) Three vectors have the same magnitude of 14 units. They make angles of a;, 2a and 3a with respect to the x axis, where a = 20 degrees. What is their vector sum?