Other Physics Answers

While competing in the new Triad Ice Skating Competition, Jose (62 kg), Shae-Lynn (52 kg) and Paul (73 kg) performed a Scalene Split. While at rest facing each other in the center of the rink, they pushed each other simultaneously. If Jose’s velocity was 5.5 m/s [E], and Shae-Lynn’s velocity was 4.5 m/s [S], what was Paul’s velocity?

A real image is formed with a converging lens. Which of the following actions will move the image point farther from the lens? (a) decrease the object distance (b) increase the radius of curvature (c) decreases the index of refraction (d) All are correct.

Gauge no. 36 copper wire has a diameter of 0.058m. Find the length of no. 36 copper wire which will give a resistance of 0.0005 ohms

An airplane travels 174 km on a straight course at an angle of 22.5 degrees South of East, it changes its course by moving 100 km, South and lastly moving 180 km, 30 degrees, West of South. Determine the resultant displacement, angle and direction.

After the energy is transferred to the earth's surface (land, water) some of the energy is

The Penman equation given below can be applied to a leaf as well as a wet surface. However, the two surfaces differ significantly.

𝜆𝐸 = Δ𝑅 +𝜌𝑐 {𝑒 (𝑇)−𝑒}𝑟−1 𝑛𝑝𝑠𝐻 / Δ+𝛾∗

Discuss two ways in which these systems differ.

A marathon runner, treated as a cylinder with diameter of 0.42 m running at 4.5 ms-1 relative to the surrounding air, has a net radiation load of 350 Wm−2. The air temperature and vapor pressure are 25°C and 2.40 kPa, respectively. Assuming that the runner’s skin is covered with sweat that is a saturated salt solution for which the relative humidity of air in contact with the solution is 68%. The specific heat of air, cp, at constant pressure is 1005 Jkg-1K-1.

i) Calculate the resistance to sensible heat transfer, rH.

ii) Determine the value of the modified psychrometer constant (𝛾∗).

iii) Calculate the saturation vapor pressure deficit at temperature of 25 °C.

iv) Using the Penmann Equation, estimate the rate of latent heat loss (λE).

Mean wind speeds u(z), averaged over 30 minutes, were measured simultaneously at several heights z above a plantation in conditions when a logarithmic wind profile was expected. Results are shown in the table below. A graph of u(z) vs ln(z-d) is also shown below. The height h of the plantation is 6 m.

 u (m/s) - 2.7; 3.3; 3.7; 4.1; 4.4; 4.7

z (m) - 10; 20; 30; 40; 50; 60

 Graph of windpeed (u) vs ln (z-d)

 y = 1.0963x - 0.9741 

Assume the zero plane displacement d was 4.0 m. Use von Karman’s constant k = 0.41

a) Using the graph determine the roughness length of the canopy.

b) Using the graph determine the friction velocity.

Explain Bernoulli’s Theorem with the help of a diagram and state the equation as well.