D. because Land does reach higher temperatures then water and Land heats more rapidly
Answer:
1. The law of universal gravitation is , where F=force, G=gravitational constant, m=mass, r=radius. It's an inverse square law, because there's a squared term in the denominator. It's really neat because it's basically the same thing as Coulomb's law () but just with big things instead of small ones!
2. Ptolemy was a Greek mathematician who believed in a geocentric model, or that the earth was the center of the universe and the sun revolved around it. Copernicus believed in a heliocentric model, which is exactly the opposite. Of course we now agree with Copernicus. Both scientists used extensive proofs and logic to come to their conclusions, but ultimately Copernicus was correct.
3. The first image, Path A, shows how the ball will fly. This is because of Newton's laws: the object will keep going in the direction it was last going. The force is not circular; the force is basically tangent to the circle at every point. Just try doing this with your bike (I do this in my driveway) by spinning in circles, then just stopping: you will go along Path A. Also, this is the centripetal force, which says that the force is towards the inside; this causes the ball to go outwards when you let go.
Answer:
E=147898.01J
Explanation:
A 5.0-kg cannonball is fired over level ground with a velocity of 2.00 ⨯ 102 m/s at an angle of 25° above the horizontal. Just before it hits the ground its speed is 150 m/s. Over the entire trip, find the change in the thermal energy of the cannonball and air
firstly , we look for the time of flight it takes to make the projectile path
T=2Usin∅/g
take g= 9.81m/s
T=2*200sin25/(9.81)
T=17.23Secs
energy is force *distance
E=f*d
f=m*g
f=5*9.81
f=49.05N
s=distance
s=(v+u)T/2
s=(150+200)17.23/2
s=3015.25m
49.05N*3015.25m
E=147898.01J
Answer:
Visible waves can be seen by people.
Explanation:
Electromagnetic waves comprises of different kind of waves. It consists of cosmic waves, x-rays waves, gamma waves, ultra violet waves, visible waves, infrared waves, microwaves. Among these waves, depending upon the wavelength of each kind of waves, it is visible and invisible to naked eyes. Thus, visible waves are the one which can be seen by people in naked eyes. As the wavelength of these waves are in comparable to the eye sight, so it can be seen by people.
The load value for interrupts every one milliseconds is
The load value for interrupts every millisecond is
However, we can only load integer values, therefore we apply
When the delay is 1 ms, it is accurate, but when the delay is 1 us, it is a little bit less. We are unable to provide an accurate 1 us delay interrupt because this requires a fractional value was calculated.
<h3>What does a SysTick timer do?</h3>
- The systick timer has an auto reload and a 24-bit countdown timer.
- An RTOS scheduler typically uses it to provide a periodic interrupt.
- The Cortex-M CPU clock is used as the default clock source for the systick timer.
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