Hi! I explain physics/math problems. You may use these videos to help understand certain concepts, or to get a better idea of how to solve similar problems if you ever come across them.
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Write the following as full (decimal) numbers without prefixes on the units: (a) 286.6 mm, (b) 85 μV
13:54
Write the following as full (decimal) numbers without prefixes on the units: (a) 286.6 mm, (b) 85 μV
What is the percent uncertainty in the measurement 5.48 ± 0.25 m?
1:42
What is the percent uncertainty in the measurement 5.48 ± 0.25 m?
Write out the following numbers in full with the correct number of zeros: (a) 8.69 x 10^4, (b)
4:51
Write out the following numbers in full with the correct number of zeros: (a) 8.69 x 10^4, (b)
Write the following numbers in powers of 10 notation: (a) 1.156, (b) 21.8, (c) 0.0068, (d) 328.65,
8:47
Write the following numbers in powers of 10 notation: (a) 1.156, (b) 21.8, (c) 0.0068, (d) 328.65,
How many significant figures do each of the following numbers have: (a) 214, (b) 81.60, (c) 7.03
7:37
How many significant figures do each of the following numbers have: (a) 214, (b) 81.60, (c) 7.03
Earth is approximately a sphere of radius 6.37 x 10^6 m. What are (a) its circumference in kilometer
7:36
Earth is approximately a sphere of radius 6.37 x 10^6 m. What are (a) its circumference in kilometer
An electron with an initial velocity v0 = 1.50 x 10^5 m/s enters a region of length L = 1.00 cm
6:08
An electron with an initial velocity v0 = 1.50 x 10^5 m/s enters a region of length L = 1.00 cm
How much work did the movers do (horizontally) pushing a 46.0-kg crate 10.3 m across a rough floor
3:52
How much work did the movers do (horizontally) pushing a 46.0-kg crate 10.3 m across a rough floor
Drag-race tires in contact with an asphalt surface have a very high coefficient of static friction.
4:55
Drag-race tires in contact with an asphalt surface have a very high coefficient of static friction.
A 14.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given
3:17
A 14.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given
What potential difference is needed to stop an electron that has an initial velocity v = 6.0 x 10^5
5:05
What potential difference is needed to stop an electron that has an initial velocity v = 6.0 x 10^5
How much kinetic energy will an electron gain (in joules and eV) if it accelerates through a
4:03
How much kinetic energy will an electron gain (in joules and eV) if it accelerates through a
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -28 µC. How many
2:58
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -28 µC. How many
A small sphere of charge 0.800 μC hangs from the end of a spring as in Figure P15.7a. When another
5:26
A small sphere of charge 0.800 μC hangs from the end of a spring as in Figure P15.7a. When another
A molecule of DNA (deoxyribonucleic acid) is 2.17 μm long. The ends of the molecule become singly
5:31
A molecule of DNA (deoxyribonucleic acid) is 2.17 μm long. The ends of the molecule become singly
The nucleus of 8-Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously
4:22
The nucleus of 8-Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously
A small sphere of mass m = 7.50 g and charge q1 = 32.0 nC is attached to the end of a string and
10:40
A small sphere of mass m = 7.50 g and charge q1 = 32.0 nC is attached to the end of a string and
A charged particle A exerts a force of 2.62 N to the right on charged particle B when the particles
6:54
A charged particle A exerts a force of 2.62 N to the right on charged particle B when the particles
Two metal balls A and B of negligible radius are floating at rest on Space Station Freedom between
7:05
Two metal balls A and B of negligible radius are floating at rest on Space Station Freedom between
The Zero Gravity Research Facility at the NASA Glenn Research Center includes a 145 m drop tower.
7:18
The Zero Gravity Research Facility at the NASA Glenn Research Center includes a 145 m drop tower.
In 1889, at Jubbulpore, India, a tug-of-war was finally won after 2 h 41 min, with the winning team
2:16
In 1889, at Jubbulpore, India, a tug-of-war was finally won after 2 h 41 min, with the winning team
Most important in an investigation of an airplane crash by the U.S. National Transportation Safety
4:29
Most important in an investigation of an airplane crash by the U.S. National Transportation Safety
An abrupt slowdown in concentrated traffic can travel as a pulse, termed a shock wave, along the
12:29
An abrupt slowdown in concentrated traffic can travel as a pulse, termed a shock wave, along the
You are to drive 300 km to an interview. The interview is at 11:15 A.M. You plan to drive at 100
3:08
You are to drive 300 km to an interview. The interview is at 11:15 A.M. You plan to drive at 100
To set a speed record in a measured (straight-line) distance d, a race car must be driven first in
14:27
To set a speed record in a measured (straight-line) distance d, a race car must be driven first in
From January 26, 1977, to September 18, 1983, George Meegan of Great Britain walked from Ushuaia, at
5:00
From January 26, 1977, to September 18, 1983, George Meegan of Great Britain walked from Ushuaia, at
The wings on a stonefly do not flap, and thus the insect cannot fly. However, when the insect is on
5:17
The wings on a stonefly do not flap, and thus the insect cannot fly. However, when the insect is on
The position of a particle as it moves along a y axis is given by y = (2.0 cm) sin (πt/4), with t in
14:23
The position of a particle as it moves along a y axis is given by y = (2.0 cm) sin (πt/4), with t in
In 1 km races, runner 1 on track 1 (with time 2 min, 27.95 s) appears to be faster than runner 2 on
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In 1 km races, runner 1 on track 1 (with time 2 min, 27.95 s) appears to be faster than runner 2 on
Two trains, each having a speed of 30 km/h, are headed at each other on the same straight track. A
2:41
Two trains, each having a speed of 30 km/h, are headed at each other on the same straight track. A