Answer :
(a) The speed of light in three significant figures is,
(b) The speed of light in five significant figures is,
(c) The speed of light in seven significant figures is,
Explanation :
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
As we are given that the speed of light is:
In the given value, there are 9 significant figures.
(a) Now we have to determine the speed of light in three significant figures.
For three significant figure, we round off the digits and we get:
(b) Now we have to determine the speed of light in five significant figures.
(c) Now we have to determine the speed of light in seven significant figures.
B. At the equator
Explanation:
The energy coming from the Sun hits the Earth's surface at different angles, depending on the latitude of the place. The more perpendicular the ray of lights hit the surface, the more the energy transmitted to the Earth's surface, the warmer the location.
The angle at which the ray of lights hit the Earth is related to the latitude: in particular, the ray of lights arrive perpendicular at the equator (), they arrive at larger angle in the United States (which is located at intermediate latitudes) and they arrive at the largest angles at the poles. For this reason, the sun's most energy is concentrated at the equator.
An artificial satellite is one that was manufactured by people ... most likely on Earth ... and then launched and placed into orbit around Earth, the sun, the moon, a planet, an asteroid etc.
Explanation:
The torque exerted on the wrench is
since the force is applied perpendicular to the wrench, in which sin90 = 1. The torque then is
Answer:
When a doctor or nurse places a stethoscope diaphragm on a patient's chest, sound waves traveling through the patient's body cause the flat surface of the diaphragm to vibrate. Those vibrations would travel outward if the the diaphragm were a standalone device, but because the vibrating object is attached to a tube, the sound waves are channeled in a specific direction.
Each wave bounces, or reflects, off the inside walls of the rubber tube, a process called multiple reflection. In this way, each wave, in succession, reaches the eartips, or rubber nubs on the ends of the device, and finally the listener's eardrums.
The waves of high-pitch sounds, like breath and heartbeats, are traveling at higher frequencies, meaning they cause a greater number of pressure fluctuations in a given time period. Higher-pitch sounds will directly vibrate the surface area of the large, flat disc (and the plastic disc inside). This basically means the sound waves caused by the opening and closing of an artery, for instance, are the same ones that travel through the stethoscope tubing to the listener's ears.