Master Physics with Fun Quizzes & Brain Teasers!

A copper wire 225m long must experience a voltage drop of less than 2.0v when a current of 3.5 a passes through it. compute the minimum diameter of the wire in millimeters (mm) if the electrical conductivity of copper is 60.0 x106 (ohm-m)-1 . answer should be in millimetres and carried out 2 decimal places (x.xx mm)
1 Answer
the speed of a transverse wave on a string is 450 m s and the wavelength is 0.18 m the amplitude of the wave is 2.0 mm how much time is required for a particle of the string to move through a total distance of 1.0 km
1 Answer
In isothermal process: a)delta u=deltaw b)vq=vu c)delta q= delta w
1 Answer
Which best describes an example of an n-type semiconductor? it uses phosphorus so that electrical conduction is due to the movement of electrons. it uses phosphorus so that electrical conduction is due to the movement of a positive charge. it uses gallium so that electrical conduction is due to the movement of electrons. oit uses gallium so that electrical conduction is due to the movement of a positive charge.
1 Answer
How many days during one year is the sun directly overhead at noon in new york city?.
1 Answer
A person attaches a paper clip to each coil of a Slinky - about 90 in all - in such a way that waves will still travel on it. What effect, if any, will the paper clips have on the speed of the waves on the Slinky
1 Answer
The paths of the light waves that interfere to cause first-order lines (2 points) Group of answer choices differ in length by the wavelength of the light are parallel lines are the same length differ in length by one-half of the wavelength of the light
1 Answer
Helen put the soaked sandstone into a freezer for 24 hours . water in the spaces in the sandstone froze and expanded. what would happen to the sandstone as the water froze and expanded
1 Answer
Two astronauts, one of mass 60 kg and the other 70 kg, are floating in the International Space Station when one bumps into the other. The 60 kg astronaut floats away with an acceleration of 0.40 m/s2. What is the acceleration of the 70 kg astronaut?
1 Answer
Measuring electrical activity of the brain over time is done using __________. a. pet scans b. eegs c. mris d. ct scans please select the best answer from the choices provided a b c d
2 Answers
Two arrows are fired simultaneously with the same speed of 30. 0 m/s. Each arrow has a mass of 0. 100 kg. One is fired due east and the other due south. What is the magnitude of the total momentum of this two-arrow system?.
1 Answer
a slender rod of mass m and length l is released from rest in a horizontal position. what is the rod's angular velocity when it has rotated through 90
1 Answer
Explain whether the relation makes physical sense to you. i.e explain why mass and speed are in the numerator and why the radius is in the denominator in terms of your physical experiences of making something move in a circle. does the relation make sense in terms of units (perform a unit analysis) and does it survive the extreme case analysis
1 Answer
How many days during one year is the sun directly overhead at noon in new york city?.
1 Answer
The most distant stars we can currently measure stellar parallax for are approximately Group of answer choices 10,000 parsecs away. halfway across the Milky Way Galaxy. 5 parsecs away. 1,000 parsecs away.
1 Answer
On an unknown planet in the outer-reaches of the solar system, a pendulum with a 12 g bob and a string length of 4 m oscillates with a period of 2 seconds. what is the value for the acceleration due to gravity (g) on this planet? (outcome 1)
1 Answer
A silk cloth gains electrons when rubbed over a glass rod. a different glass rod gains electrons when rubbed with rabbit fur. what will happen if the two charged glass rods approach one another and why?
2 Answers
How many days during one year is the sun directly overhead at noon in new york city?.
1 Answer
Which of Newton's laws is described below?F= ma A. Newton's fourth law B. Newton's second law C. Newton's first law D. Newton's third law
2 Answers
5. describe the acceleration of the marble after it leaves the ramp. use kinematic equations to support your discussion.
1 Answer
A sphere has a radius of 21 cm if the mass of the sphere is 5kg find the density of the sphere
1 Answer
If the cylinder is originally not rotating and the block is released from rest at a height 1.54 m above the ground, to what height will this mass rebound if it bounces straight back up from the floor
1 Answer
(c) A physics teacher sets up a demonstration to teach her Year 10 class ideas about the conservation of momentum. Figure 2 shows a straight, horizontal air track and two air track trolleys, S and T, which can move along it. Figure 2 Sharp pin o Cork S T has a mass of 3 x 10-1 kg and its velocity is 1.4 m/s to the left. S has a mass of 200 g and is stationary. When T collides with S they stick together. Calculate the velocity of the trolleys after the collision. Show your working clearly and give the unit and direction. [5 marks]
1 Answer
An electric fan is running on HIGH. After the LOW button is pressed, the angular speed of the fan decreases to 84.7 rad/s in 2.96 s. The magnitude of the angular deceleration is 47.2 rad/s2. Determine the initial angular speed of the fan.
1 Answer