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Classical Mechanics
The average of 17 numbers is 10.9. If the average of the first nine numbers is 10.5 and that of the last nine numbers is 11.4, the middle number is.
11.8
11.4
10.9
11.7
Kindly, tell me how this question will be solved, please.
Thank you.
11.8
11.4
10.9
11.7
Kindly, tell me how this question will be solved, please.
Thank you.
Classical Mechanics
Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages, he covers the same distance at an average speed of 28 km/hr. How many minutes per hour does he stop?
14 minutes
15 minutes
28 minutes
None of these
Kindly, tell me how to solve this question, please.
Thank you.
14 minutes
15 minutes
28 minutes
None of these
Kindly, tell me how to solve this question, please.
Thank you.
Classical Mechanics
Estimate the mass of water on earth. The density of water is 1000kgm-³. Give ans to 1 sig fig.
Here are some approximations you can use.
Compared with oceans, lakes and rivers are tiny. Clouds have low density. There is still lots of ice in the polar regions, but much less area than in oceans.so, neglect all except the ocean which cover ⅔ of the earth.
Looking at charts of the ocean, we see that the depth is typically several thousand m ( and a serious search tells me the average depth is 4700m) the radius of the earth is 6000km. The surface area of a sphere is 4×3.14×r²
Here are some approximations you can use.
Compared with oceans, lakes and rivers are tiny. Clouds have low density. There is still lots of ice in the polar regions, but much less area than in oceans.so, neglect all except the ocean which cover ⅔ of the earth.
Looking at charts of the ocean, we see that the depth is typically several thousand m ( and a serious search tells me the average depth is 4700m) the radius of the earth is 6000km. The surface area of a sphere is 4×3.14×r²
Classical Mechanics
Sammy is 5 feet and 5.3 inches tall.
1) what is Sammy's height in inches? (Answer in 3 significant fig)
2) what is Sammy's height in feet? (Ans in 3 sig)
3) convert answer in ( B) above to miles?
4) what is Sammy's height in meters?
5) If the beach around Kokopo area is 90miles. How many Sammy's will fit the bench from head feet? (Ans in 1 sig)
1) what is Sammy's height in inches? (Answer in 3 significant fig)
2) what is Sammy's height in feet? (Ans in 3 sig)
3) convert answer in ( B) above to miles?
4) what is Sammy's height in meters?
5) If the beach around Kokopo area is 90miles. How many Sammy's will fit the bench from head feet? (Ans in 1 sig)
Classical Mechanics
How many heartbeats in a typical human lifetime? Enter answer as a number ( not as a power of ten) and in one significant figure.
Classical Mechanics
Convert 5.44 ft to miles ( answer in 3 significant figures)
Classical Mechanics
Estimate the mass of water on earth. The density of water is 1000kgm-³.Give answer to 1 significant figure.
Classical Mechanics
A thin, very light wire is wrapped
around a drum that is free to rotate.
The free end of the wire is attached
to a ball of mass m. The drum has
the same mass m. Its radius is R and
its moment of inertia is I = (1/2)mR2.
As the ball falls, the drum spins.
At an instant that the ball has
translational kinetic energy K, then what rotational kinetic energy does the drum has? explain.
around a drum that is free to rotate.
The free end of the wire is attached
to a ball of mass m. The drum has
the same mass m. Its radius is R and
its moment of inertia is I = (1/2)mR2.
As the ball falls, the drum spins.
At an instant that the ball has
translational kinetic energy K, then what rotational kinetic energy does the drum has? explain.
Classical Mechanics
You want to double the radius of a rotating solid sphere
while keeping its kinetic energy constant. (The mass
does not change.) To do this,what must be the final angular velocity
of the sphere and why?
while keeping its kinetic energy constant. (The mass
does not change.) To do this,what must be the final angular velocity
of the sphere and why?
Classical Mechanics
Compared to a gear tooth on the
rear sprocket (on the left, of
small radius) of a bicycle, a gear
tooth on the front sprocket (on
the right, of large radius) has the same linear speed and a slower angular speed. Why?
rear sprocket (on the left, of
small radius) of a bicycle, a gear
tooth on the front sprocket (on
the right, of large radius) has the same linear speed and a slower angular speed. Why?
