Viewed Questions
What is the difference between speed and velocity?
Describing Motion
Short-Answer Questions
Assume air resistance is negligible unless otherwise stated. Calculate the displacement and velocity at times of (a) 0.500, (b) 1.00, (c) 1.50, and (d) 2.00 s for a ball thrown straight up with an initial velocity of $15.0 \mathrm{m} / \mathrm{s}$. Take the point of release to be $y_{0}=0$.
Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be $1.67 \times 10^{-27} \mathrm{kg}$
When you hear a sonic boom, you often cannot see the plane that made it. Why is that?
Questions asked
4. Which graph represents the results for a larger population? 5. Consider your answer to 4 . How do you know? In other words, how can you determine which graph represents a smaller population.
Consider the DNA extraction protocol. Why is it necessary to chelate the magnesium ions from the solution during the boiling/lysis step in the hot bath?
Vishal Gupta
Numerade educator
Problem 2: Eight identical lights, each having resistance ( R ), are connected in parallel with a ( 120 mathrm{~V} ) battery. (a) What is the voltage drop across each bulb? (b) If the current flowing through the battery is ( 2.5 mathrm{~A} ), what is the resistance of each bulb? (c) What is the power dissipated in each bulb?
Kirsty Gledhill
Problem 1: Eight identical lights, each having resistance ( R ), are connected in series with a ( 120 mathrm{~V} ) battery. (a) What is the voltage drop across each bulb? (b) If the current flowing through the circuit is ( 0.4 mathrm{~A} ), what is the resistance of each bulb? (c) What is the power dissipated in each bulb?
SLO 2 Problem 1: An object is placed 20 cm away from a converging lens that has a 15-cm focal length. Determine the position, orientation, and size of the image (a) analytically, using the lens equation, and (b) using a ray diagram.
Brandy Heflin
SLO 3 Problem 2: A proton is moving in a straight line with speed of ( v ). The position of the proton can be simultaneously measured is ( 1.5 imes 10^{-10} ) meters which is measured to a precision ( 0.14 % ). Find the uncertainty in the speed ( v ). The mass of a proton is ( m=1.67 imes 10^{-27} mathrm{~kg} ).
Ronald Prasad
SLO 3 Problem 1: An electron is moving in a straight line with a speed of ( v=1.10 imes 10^{6} mathrm{~m} / mathrm{s} ), which has been measured to a precision of ( 0.10 % ). What is the maximum precision, in meters, with which the position of the electron could be simultaneously measured? The mass of an electron is ( m=9.11 imes 10^{-31} mathrm{~kg} ).
Saharsh Talwar
Find the velocity (in ( mathrm{m} / mathrm{s} ) ) of a proton that has a momentum of ( 3.91 imes 10^{-19} mathrm{~kg} cdot mathrm{m} / mathrm{s} ).
Qudsiya Anis
If a converging lens forms a real, inverted image 12.0 cm to the right of the lens when the object is placed 35.0 cm to the left of a lens, determine the focal length of the lens.
Christopher Dzorkpata
escape the attraction of the atomic nucleus. Note: an electron infinitely far from the proton is said to have zero potential energy; any closer, and its potential energy is said to be negative, | Level (n=) | Energy (in eV) | | :--- | :--- | | 1 | -13.6 | | 2 | -3.40 | | 3 | -1.51 | | 4 | -0.850 | | 5 | -0.544 | | 6 | -0.378 | (a) What energy (in eV) would a photon have, if it were emitted when an electron dropped from the n = 6 level to n = 5?
