A positron with kinetic energy 3.00 keV is projected into a uniform magnetic field of magnitude 0.140 T, with its velocity vector making an angle of 88.0° with the field. Find (a) the period, (b) the pitch p, and (c) the radius r of its helical path.
ASAP
In: Physics
A pair of bumper cars in an amusement park ride collide elastically as one approaches the other directly from the rear, as seen in part (a) of the figure below. ((a) before collision, (b) after collision) One has a mass of m1 = 462 kg and the other m2 = 546 kg, owing to differences in passenger mass. If the lighter one approaches at v1 = 4.48 m/s and the other is moving at v2 = 3.63 m/s, calculate the velocity of the lighter car after the collision.
Calculate the velocity of the heavier car after the collision.
Calculate the change in momentum of the lighter car.
Calculate the change in momentum of the heavier car.
In: Physics
A major league pitcher stands on the pitching mound 60ft 6in from home plate throws a fastball at 105 mph. Assume both the batter and pitcher are the same height (6ft 6in) and the ball is released 55 inches above the ground when thrown horizontal.
a. How far will a 340 gram baseball travel before hitting the ground?
b. How high is the ball above the ground when it passes over home plate?
c. How long does it take to reach home plate?
Now let’s look at what happens when the ball is hit, using the setup from the last problem. When hit the ball’s speed is an average of 30% faster and leaves the bat at a 5 degree angle.
(a) How high is the ball when it passes the pitching mound?
(b) How far will the ball travel?
In: Physics
A diverging mirror has a focal length of f = 300 mm .
A) Calculate the image distance for an object located halfway between the focal point and the mirror. Express your answer with the appropriate units. Follow the sign convention.
B) Calculate the magnification for an object located halfway between the focal point and the mirror. Express your answer using three significant digits. Follow the sign convention.
C) Calculate the image distance for an object located at the focal point. Express your answer with the appropriate units. Follow the sign convention.
D) Calculate the magnification for an object located at the focal point.
E) Calculate the image distance for an object located halfway between the focal point and the center of curvature. Express your answer with the appropriate units. Follow the sign convention.
F) Calculate the magnification for an object located halfway between the focal point and the center of curvature.
G) Calculate the image distance for an object located at the center of curvature. Express your answer with the appropriate units. Follow the sign convention.
H) Calculate the magnification for an object located at the center of curvature. Express your answer using three significant digits. Follow the sign convention.
I) Calculate the image distance for an object located a distance f beyond the center of curvature. Express your answer with the appropriate units. Follow the sign convention.
J) Calculate the magnification for an object located a distance f beyond the center of curvature.
K) Calculate the image distance for an object located at infinity. Express your answer with the appropriate units. Follow the sign convention.
L) Calculate the magnification for an object located at infinity.
In: Physics
Over the course of a multi-stage 4120-km bicycle race, the front wheel of an athlete's bicycle makes 1.69x106 revolutions. How many revolutions would the wheel have made during the race if its radius had been 1.2 cm larger?
In: Physics
At a certain location, electromagnetic wave 1 is measured to have an average electric field of Eav = 152 N/C, and electromagnetic wave 2 is measured to have an average magnetic field of Bav = 0.87 µT.
a. (5 points) Calculate the average intensity of each wave.
b. (5 points) If the electromagnetic waves are being measured 0.54 m from their light sources (assume that they are emitting light uniformly in all directions), what average power is each source emitting? By how many 60 W incandescent light bulbs would each light source need to be replaced to emit the same average power?
c. (5 points) Suppose an average human sun bathes in the light from wave 2 for 45 minutes. If we assume that this person exposes 0.45 m 2 of their skin to this light and that none of the light is reflected by the skin, how much energy is absorbed into their skin? If you could somehow utilize this energy to lift a 70. kg person on the surface of the Earth, how high could the person be lifted?
d. (5 points) Assume that both light waves are initially unpolarized. We decide to send the higher intensity light wave through a polarizer-analyzer combination so that its final intensity matches that of the lower (unpolarized) intensity light wave. If the transmission axis of the first polarizer is horizontal, how must the transmission axis of the analyzer be oriented so that the light intensities match? Express your angle as measured from the vertical axis
In: Physics
A 215 g object is attached to a spring that has a force constant of 72.5 N/m. The object is pulled 7.75
cm to the right of equilibrium and released from rest to slide on a horizontal, frictionless table.
Calculate the maximum speed of the object.
maximum speed:
m/s
Find the locations of the object when its velocity is one-third of the maximum speed. Treat the equilibrium position as zero, positions to the right as positive, and positions to the left as negative.
position:
cm
position:
cm
In: Physics
Jae throws an object with a certain velocity and a certain angle with respect to the horizontal direction. Calculate the angle at which the horizontal displacement of the object is going to be maximum, ignoring air resistance. Calculate the angle at which the horizontal displacement of the object is going to be half of the maximum. You may need to think about using the velocity equation first, estimate the time it takes to get to the highest position in terms of variables, write the position equations in terms of what you got from the velocity equation.
In: Physics
In a series oscillating RLC circuit, R=16.0Ω, C=1.2μF,L=.20mH, and ε=εmsinωdt with εm=45.0Vandωd=3000rad/s. For time t=0.442ms find (a) the ratePg at which energy is being suppliedby the generator, (b) the rate Pc atwhich the energy in the capacitor is changing, and (d) the rate PRat which energy is being dissipated in the resistor.
In: Physics
In what way do sports implements give an advantage?
In: Physics
a)Explain the pattern followed by a body undergoing strain, including the elastic region, the elastic limit, plastic deformation, and failure
b) List and explain briefly six different stresses, and give an example of each
In: Physics
Equal charges, q, are placed at the vertices of a hexagon from infinity. What is the work done to accomplish this?
please help!!
In: Physics
Explain why spectral lines are useful in determining the chemical composition of their source.
In: Physics
Question 9
One of the key early tests of Einstein's General Theory of Relativity was
the bending of the path of starlight and resulting apparent shift in the position of stars because of the Sun's mass.
sending a twin in a spaceship to the nearest star and back at a high Lorentz factor.
the Michelson-Morley experiment.
measuring the time dilation effect from gas falling into a black hole.
Question 10
According to General Relativity,
Group of answer choices
you can think of space as "flowing in" towards massive objects.
space-time has curvature.
time runs fastest far away from massive objects.
the path of light is bent when photons move through curved space.
All of these choices are correct.
None of these choices is correct.
Question 11
You are in a rocket ship deep in space and are about to pass a fellow traveler going the opposite direction at 99.9% the speed of light. You think her clock is _________ than yours and she thinks that your clock is __________ than hers.
faster; faster
faster; slower
slower; slower
slower; faster
Question 12
By observing a _____________ in 1919, astronomers were able to test the prediction that a massive object bends the path taken by light.
Group of answer choices
transit of the planet Mercury across the Sun
transit of the planet Venus across the Sun
supernova
total solar eclipse
total lunar eclipse
Question 13
The twin paradox is
a hypothetical experiment that demonstrates that special relativity is wrong
a hypothetical situation that seemingly presents a paradox but is actually resolved by a clearer understanding of the situation
a real experiment that demonstrates that special relativity is wrong
a real experiment that is consistent with the predictions made by special relativity
Question 14
Within special relativity, time dilation refers to ...
the slowing of the passage of time due to motion near the speed of light.
the speeding up of the passage of time due to motion near the speed of light.
the gradual slowing of the rotation of pulsars.
the Doppler shift of light.
Question 15
The alteration of our perception of space and time due to motion near the speed of light is described by
Group of answer choices
special relativity
general relativity
Newton's laws of motion
Galileo's law of inertia
Question 16
The curving of space by a massive object is described by which theory?
Group of answer choices
special relativity
general relativity
Newton's laws of motion
Galileo's law of inertia
In: Physics
You are measuring the distance between the 6th and 2nd levels of the hydrogen atom while it is passing you at 99.99% of c.
A) What will this distance appear to be in the direction perpendicular to the traveling speed.
B) What will this distance appear to be in the direction parallel to the traveling speed.
In: Physics