Search & Filtering
How far does the electron of a hydrogen atom have to be moved from the nucleus for the force of attraction in the electron to equal the weight at the earth surface. Mass of earth, proton and nucleus are given. Also given are charge of an electron, proton. Mass of neutron is given as 0
Hello.
I am trying to calculate the ground reaction forces of a horse walking as I have got the reaction force of them standing in one spot. The weight of the horse is 500kg and distributed 52% of weight on the front legs. The answer for both front legs was 2548N and one leg being half of this. I am wondering how to get the forces of the horse was walking on a hard surface such as concrete
thanks
The plunger and the needle of a hypodermic syringe have areas of 0.5 cm2 and 0.0006 cm2 , respectively. To inject a vaccine, a nurse pushes the plunger with a force of 5.5 N. What pressure is transmitted to the vaccine?
A particle moves along the x-axis according to the expression x=3t² - 2t where x is in m and t is in s. What is the displacement of the particle in time intervals t=0 to t=1s and t=1s to t=4s
1.A truck and an ambulance move at the same rate of 13 m/s toward each other but on different lanes. If the ambulance siren emits sound of frequency 1200 Hz, what is the frequency of the sound that the truck driver hears?
2. The police car is moving toward a warehouse at 30 m/s. If the police car is emitting a 1kHz sound, what frequency does the driver hear reflected from the warehouse? Assume that the speed of sound is 340 m/s.
3. What is the frequency heard by a person driving at 15 m/s toward a factory whistle that is blowing at a frequency of 800 Hz? Assume that the speed of sound is 340 m/s
1. A police car’s siren emits a sinusoidal wave with frequency of 300 Hz. The speed of sound is 340 m/s and the air is still.
a.) If a listener is at rest and the siren is moving away at 30 m/s, what frequency does the listener hear?
b.) If the siren is at rest and the listener is moving away from it at 30 m/s, what frequency does the listener hear?
2. The siren is moving away from the listener with a speed of 45 m/s relative to the air, and the listener is moving toward the siren with a speed of 15 m/s relative to the air. If the siren is emitting a 1kHz sound, what frequency does the listener hear?
A. What is the relationship between liquid pressure and the depth of a liquid? Between liquid pressure and density?
B. If you swim beneath the surface in salt water, will the pressure be greater than in freshwater at the same depth? Why or why not?
C. Why does buoyant force act upward on an object submerged in water?
D. Fill in the blanks: An object denser than water will _ in water. An object less dense than water will _ in water. An object with the same density of water will _ in water.
E. Why do airplane wings have curved upper portion?
F. How does Bernoulli's principle apply to the flight of airplanes?
G. What happens to the pressure in all parts of a confined fluid if the pressure in one part is increased?
On a very hot day in Manila, an oil tanker loaded 50,000 liters of fuel. It traveled to Baguio, which was 20 K colder than Manila. How many liters where delivered to Baguio? (𝛽𝑔𝑎𝑠𝑜𝑙𝑖𝑛𝑒=0.95 𝑥 10−3)
Using the equation for acceleration due to gravity (g), compute the
approximate value of acceleration due to gravity with the given values: mass of Earth = 6.0 x 10^24kg and radius of Earth = 6.37 x 10^6 m. Compare the value you had with the
acceleration due to gravity we use which is 9.8 m/s^2
Complete solution
1. Copper shot (0.100 kg) is heated in boiling oil. After this, it is submerged in old water (0.300 kg at 20 ºC). If the water’s temperature turned 23.0 ºC, what was the temperature of the hot oil?
2. What is the new length of a bar made of pure gold at 75 ºC if it has a length 0.3 meters at 10 º C?
3.At what temperature will the Celsius and Fahrenheit scale have the same value?
