A bowl of bulalo is being heated in a microwave oven. The effective area of the bulalo that is exposed to microwaves is 1.6x10 -2 m 2 . The mass of the bulalo is 0.25 kg, and its specific heat capacity 3400 J/kg.C°. The temperature rises by 80.0 C° in 7.0 minutes. What is the intensity of the microwaves in the oven?

A bowl of bulalo is being heated in a microwave oven. The effective area of the bulalo that is exposed to microwaves is 1.6x10 -2 m 2 . The mass of the bulalo is 0.25 kg, and its specific heat capacity 3400 J/kg.C°. The temperature rises by 80.0 C° in 7.0 minutes. What is the intensity of the microwaves in the oven?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 79P: A device called an insolation meter is used to measure the intensity of sunlight. It has an area of...

See similar textbooks

Similar questions

Energy from the Sun arrives at the top of Earth’s atmosphere with an intensity of 1400 W/m2. How long does it take for 1.80109 J to arrive on an area of 1.00 m2?
The low-frequency speaker of a stereo set has asurface area of A=0.05 m2 and produces 1 W of acoustical power. (a) What is the intensity at the speaker? (b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.1 W/m2?
The energy from the sun warms the portion of the earth facing the sun during the daylight hours. Why are the North and South Poles cold while the equator is quite warm?
Engineering Application (a) A photovoltaic array of (solar cells) is 10.0% ef?cient in gathering solar energy and converting it to electricity. If the average intensity of sunlight on one day is 700W/m2, what area should your array have to gather energy at the rate of 100 W? (b) What is the maximum test of the array if it must pay for itself in two years of operation averaging 10.0 hours per day? Assume that it earns money at the rate of 9.00 (¢ per kilowatthour.
What is the difference between propagation speed and the frequency of a mechanical wave? Does one or both affect wavelength? If so, how?
The light intensity 4.4 m from a light bulb is 0.59 W/m^2. What is the power output of the bulb, assuming it radiates equally in all directions?
A dish of lasagna is being heated in a microwave oven. The effective area of the lasagna that is exposed to the microwaves is 2.89 x 10^-2 m2. The mass of the lasagna is 0.680 kg, and it's specific heat capacity is 3920 j /(kg C degrees). The temperature rises by 87.1 degrees Celsius in 6.7 minutes. What is the intensity of the microwaves in the oven?
Assume the mostly infrared radiation from a heat lamp acts like a continuous wave with wavelength 1.50 µm . If the lamp’s 200-W output is focused on a person’s shoulder, over a circular area 25.0 cm in diameter, what is the intensity in W/m2?
A dish of lasagna is being heated in a microwave oven. The eff ective area of the lasagna that is exposed to the microwaves is 2.2 × 10−2 m2. The mass of the lasagna is 0.35 kg, and its specifi c heat capacity is 3200 J/(kg · C°). The temperature rises by 72 °C in 8.0 minutes. What is the intensity of the microwaves in the oven?
A dark blue cylindrical bottle is 22 cm high and has a diameter of 7.0 cm. It is filled with water. The bottle absorbs 60% of the light that shines on it as it lies on its side in the noonday sun, with intensity 1000 W/m2. By how much will the temperature of the water increase in 5.0 min if there’s negligible heat loss to the surrounding air?
On a warm summer day (32 degrees C), it takes 4.80 s for an echo to return from a cliff across a lake. On a winter day, it takes 5.20 s. The speed of sound in air is vAc (331 + 0.60T)m/s, where T is the temperature in degrees C. What is the temperature on the winter day?
A 33 kHz soundwave travels in air at v=355 m/s What is the temperature of the air through which it travels? What is the velocity and wavelength?