You're driving down the highway late one night at 20 m/s when a deer steps onto the road 39 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 12 m/s2 . How much distance is between you and the deer when you come to a stop? What is the maximum speed you could have and still not hit the deer?

What are the recent technology of x-ray fluoroscopy?

1.A radioactive sample has a half-life of 2.5 min. What fraction of the sample is left after 40 min?

2. The energy of a 2.00 keV electron is known to within

Moving with proton i = (2i + 3j - k) m / s velocity in a region where uniform magnetic field B = (21i + 4j + k) T and uniform electric field E = (4i-j-2k) V / m It is. a) Calculate the electrical, magnetic and total force acting on the particle? b) How much angle does the total force vector with the positive x-axis? c) What is the acceleration of the proton? (mp = 1.6x10 ^ 27kg for proton q = 1.6x10 ^ -19C)

B=(2i+4j+k)

a) A photon of frequency 8.2 x 10¹⁵ Hz is incident upon a photoelectric apparatus containing a metal whose threshold frequency is 3.6 x 10¹⁵ Hz. What is the stopping voltage?

b)A photon of frequency 7.2 x 10¹⁵ Hz is incident upon a metal whose threshold frequency is 8.9 x 10¹⁴ Hz. What is the speed of the photoelectron?

c)Electrons are ejected from a photoelectric surface with a maximum speed of 4.20 x 10⁵ m/s. If the work function of the metal is 2.55 eV, what is the wavelength of the incident light?

2 identical magnets are arranged with like poles facing each other on a frictionless 30 degree slope. The magnet on the lower position is held in place and can't move. the magnet in the higher position on the track is held in place by the balance of the upslope force due to the magnetic repolsion between the magnets and the downslope force due to the weight of the magnet. The mass of the magnets is 50 grams each. The distance between the magnets is 5 cm.

(1) what is the magnetic force between the magnets? answer in newtons.

(2) If the strength of the magnetic force between the magnets is of the form: F= C*(1/r^3), what is the separation between the magnets when the angle of the slope is only 20 degrees? answer in cm.

(3) what would the angle of the slope be to get a separation of 7.11 cm? answer in degrees.

(4) what would the separation be at a slope of 5 degrees? answer in cm.

(5) what would the force between the magnets be if the slope was 5 degrees? answer in Newtons.

How do you estimate the uncertainty?

Incorrect. Incorrect; Try Again; 7 attempts remaining. Feedback. This is the image distance (i.e., the distance from the mirror to the image). You want the distance from Joe to the image, so you must combine this distance with Joe's distance from the mirror. Should you add or subtract? End of feedback.

Two friends hold on to a rope, one at each end, on a smooth, frictionless ice surface. They skate in a circle about an axis through the center of the rope and perpendicular to the ice. The mass of one friend is 81.0 kg and the other has a mass of 125.0 kg. The rope of negligible mass is 4.5 m long and they move at a speed of 4.50 m/s.

(a) What is the magnitude of the angular momentum of the system comprised of the two friends? kg · m2/s

(b) They now pull on the rope and move closer to each other so that the rope between them is now half as long. Determine the speed with which they move now. m/s

(c) The two friends have to do work in order to move closer to each other. How much work did they do? J

Three small balls of mass 5.6 kg, 2.2 kg, and 2.8 kg are connected by light rods laying along the y-axis. The rod connecting the first and second balls is 4.6 m long and the rod connecting the second and third balls is 2.5 m. The entire system rotates around the x-axis, which is between the first and second balls and a distance 2.9 m from the first ball, at a rotational speed 1.2 s^-1

(a) What are the linear speeds of the three objects?
First Object:  3.48 m/s
Second Object:  2.04 m/s
Third Object: 5.04 m/s
(b) What is the linear kinetic energy of each of the balls?
First Object:  33.909 J
Second Object:  4.577 J
Third Object:  35.56224 J
(c) What is the total kinetic energy of the system? 74.04824 J
(d) What is the moment of inertia around the x-axis of each of the balls?
First Object:  47.096 kg*m^2
Second Object:  6.358 kg*m^2
Third Object:  49.392 kg*m^2
(e) What is the rotational kinetic energy of each of the balls?
First Object:  33.909 J
Second Object:  4.5776 J
Third Object:  35.56224 J
(f) What is the rotational kinetic energy of the system?
74.049 J
(g) What is the distance of the center of mass of the system from the first ball?
(h) What moment of inertia of each ball around the center of mass?
First Object:
Second Object:
Third Object:
(i) What is the moment of inertia of the system with respect to the center of mass? It's not 2.97, 3.4188, or 2.31
(j) What is the moment of inertia due to the shift of the rotational axis from the center of mass to the x-axis?
(k) What is the moment of inertia of the system around the x-axis?
(l) What is the linear speed of the system?
(m) What is the rotational speed of the system?
(n) What is the linear kinetic energy of the system?
(o) What is the rotational kinetic energy of the system? 74.049 J

don't know g-n help please and thank you!

A bus contains a 1500 kg flywheel (a disk that has a 0.55 m radius) and has a total mass of 11000 kg.

m = 1500 kg
r = 0.55 m
m_t = 11000 kg
v₁ = 19 m/s
v₂ = 2.75 m/s

A. Calculate the angular velocity the flywheel must have to contain enough energy to take the bus from rest to a speed of 19 m/s in rad/s, assuming 90.0% of the rotational kinetic energy can be transformed into translational energy.

B. How high a hill can the bus climb with this stored energy and still have a speed of 2.75 m/s at the top of the hill in m?

A 90.0 cm^3 box contains helium at a pressure of 2.50 atm and a temperature of 100 ∘C. It is placed in thermal contact with a 220 cm^3 box containing argon at a pressure of 3.50 atm and a temperature of 400 ∘C

PartA

What is the initial thermal energy of each gas? Ei(He),Ei(Ar)=

PartB

What is the final thermal energy of each gas? Ei(He),Ei(Ar)=

PartC

How much heat energy is transferred, and in which direction? Etrans =

PartE

What is the final temperature? Tf= ? C

PartF

What is the final pressure in each box? pf(He), pf(Ar) = ? Pa

Thank you work is much appreciated I am not the greatest in physics, thank you

IM.82 A distributor of industrial equipment purchases specialized compressors for use in air conditioners. The regular price is $55, however, the manufacturer of this compressor offers quantity discounts per the following discount schedule: Option Plan Quantity Discount A 1 - 499 0% B 500 - 1,199 0.75% C 1,200+ 1.50% The distributor pays $68 each time it places an order with the manufacturer. Holding costs are negligible (none) but they do earn 7% annual interest on all cash balances (meaning there will be a financial opportunity cost when they put cash into inventory). Annual demand is expected to be 7,000 units. When there is no quantity discount (Option Plan A, the first row of the schedule listed above), what is the adjusted order quantity? (Display your answer to the nearest whole number.) Number Based on your answer to the previous question, and based on the annual demand as stated above, what will be the annual ordering costs? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (two questions back), what will be the average number of units held in inventory? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (three questions back), and assuming a materials cost for the given discount, what will be the annual holding cost? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (four questions back), and assuming a materials cost for the given discount, what will be the total annual inventory cost? (Display your answer to the nearest whole number.) Number When there is a 0.75% discount (Option Plan B, the second row of the schedule listed above), what is the adjusted order quantity? (Display your answer to the nearest whole number.) Number Based on your answer to the previous question, and based on the annual demand as stated above, what will be the annual ordering costs? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (two questions back), what will be the average number of units held in inventory? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (three questions back), and assuming a materials cost for the given discount, what will be the annual holding cost? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (four questions back), and assuming a materials cost for the given discount, what will be the total annual inventory cost? (Display your answer to the nearest whole number.) Number When there is a 1.50% discount (Option Plan C, the third row of the schedule listed above), what is the adjusted order quantity? (Display your answer to the nearest whole number.) Number Based on your answer to the previous question, and based on the annual demand as stated above, what will be the annual ordering costs? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (two questions back), what will be the average number of units held in inventory? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (three questions back), and assuming a materials cost for the given discount, what will be the annual holding cost? (Display your answer to the nearest whole number.) Number Using the adjusted order quantity as determined above (four questions back), and assuming a materials cost for the given discount, what will be the total annual inventory cost? (Display your answer to the nearest whole number.) Number Sort each option plan from left to right by dragging the MOST preferred option plan to the left, and the LEAST preferred option plan to the right: