21. An irregularly shaped object weighs 10.0 N in air, but 4.00 N when submerged in water. What is the density of the object? Ans. 1.67 x 10³ kg/m³

> In this problem you will consider the balance of thermal energy radiated and absorbed by a person. Assume that the person is wearing only a skimpy bathing suit of negligible area. As a rough approximation, the area of a human body may be considered to be that of the sides of a cylinder of length L = 2.0 m and circumference C = 0.8 m. For the Stefan-Boltzmann constant use o= 5.67 x 10-8 W/m²/K4 Part C Now calculate Por, the thermal power absorbed by the person from the thermal radiation field in the room, which is assumed to be at Troom = 20°C. If you do not understand the role played by the emissivities of room and person, be sure to open the hint on that topic. Express the thermal power numerically, giving your answer to the nearest 10 W. View Available Hint(s) Por= Submit Part D [-] ΑΣΦ. Pnet = 17] ΑΣΦ Find Paet, the net power radiated by the person when in a room with temperature Troom= 20°C. Express the net radiated power numerically, to the nearest 10 W. ▸ View Available Hint(s)…

Ex. 51 The temperature of interstellar space has an average value of about 5 K. Find the rms speed of a proton in the Imp space. [m, = 1.673 x 10 27 kg, kg = 1.38 x 10 23 J/K] %3D %3D

Pls help on this question.

Problem 1: a) Calculate the most probable speed, average speed, and rms speed for nitrogen N, at room temperature. b) Use a computer to plot the Maxwell speed distribution for nitrogen molecules at T=300K and T=600K. Plot both as line graphs on the same axes and label the axes. c) At room temperature, what fraction of the nitrogen molecules in the air are moving at less than 300m/s?

RTI The molecules in a six-particle gas have velocities ₁ (201-30j) m/s V2 (10i+60j) m/s 73=(-501 +20j) m/s 7= 30i m/s Vs (40i-40j) m/s ₁=(-50 i 10j) m/s Calculate Varg Express the x and y components of the velocity in meters per second separated by a comma. Uz avg, Uy avg Submit Part B VD|| ΑΣΦ Request Answer W Calculate Davg- Express your answer with the appropriate units. ? m/s

When a cooked chicken breast is first removed from an oven, it has a surface temperature of 180 C. By the time the chicken is served at the table it has cooled to 120 C. What is the ratio of energy flux density emitted from the surface of the chicken when it has cooled to that when it was hot? Group of answer choices A. depends on mass of the chicken B. 0.20 C. 0.57 D. 0.67 E. depends on surface area of the chicken

A. 0.80 m³ D. 7.0 m³ B. 1.25 m³ E. 11 m³ C. 1.9 m³ F. none of the above 1--1 NRDHW A helium-filled balloon has volume 3.5_m³, temperature 21.6°C, and pressure 1 atm while at sea level. If the balloon rises to 27000 ft, where the temperature is 5.1°C and the pressure is about 1/3 of its sea-level value, then find the new volume of the balloon. 7. A. 6.873 m³ D. 14.73 m³ B. 9.912 m³ E. 9.869 m³ C. 15.41 m³ F. 13.31 m³ 1--1 [carpet-6] MXJWA A 4.2 L volume of neon gas (Ne) is at a pressure of 4.1 atm and a temperature of 460 K. The atomic mass of neon is 20.2_g/mol, and the ideal gas constant is R = 8.314.J/mol K. The mass of the neon gas is closest to

d)What is the root mean square of the speed? e)What is the speed with the highest velocity?Statistical mechanics-physics

High-intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high-intensity ultrasound is focused on the tumor, raising its temperature to nearly 90°C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 4.40 MHz produced an intensity of 1425.0 W/cm. The energy was delivered in short pulses for a total time of 3.40 s over an area measuring 1.80 mm by 5.40 mm. The speed of sound in the soft tissue was 1580 m/s, and the density of that tissue was 1509.0 kg/m?. What was the wavelength A of the ultrasound beam? = m How much energy Eotal Was delivered to the tissue during the 3.40 s treatment? J Etotal = terms of use contact us help about us privacy polícy careers Show All V VS T.jpeg Free-Fall-Phet.docx free fall.png V VS T.jpeg FII F10 F8 F7 000 * F5 F6 aロ