A rocket is launched straight up. It contains two stages (Stage 1 and Stage 2) of solid rocket fuel that are designed to burn for 10.0 and 5.0 s, respectively, with no time interval between them. In Stage 1, the rocket fuel provides a net upward acceleration of 18 m/s2. In Stage 2, the net upward acceleration is 13 m/s2. Neglecting air resistance, calculate the maximum altitude above the surface of Earth of the payload and the time required for it to return back to the surface.

maximum altitude m

time required s

A 26 g ice cube at -15.0oC is placed in 204 g of water at 48.0oC. Find the final temperature of the system when equilibrium is reached. Ignore the heat capacity of the container and assume this is in a calorimeter, i.e. the system is thermally insulated from the surroundings. Give your answer in oC with 3 significant figures.

Specific heat of ice: 2.090 J/g K

Specific heat of water: 4.186 J/g K
Latent heat of fusion for water: 333 J/g

A speeding motorist zooms through a 50 km/h zone at 75 km/h (21 m/s) without noticing a stationary police car. The police officer immediatley heads after the speeder, accelerating at 2.5m/s^2. When the officer catches up to the speeder, how far down the raod are they, and how fast is the police car going?

I know you use the equations x= x_0+ v_0t+ .5at^2 and v= V_0 + at... But I want to know why we use these equations and also how does my book derive that when you set the 1st equation for the police officer and the speeding motorcycle equal it comes out to be

x_s= 2v_s0^2/a_p

THank you

Please read the article below (copy into your address bar, in case you dont undersatnd how internet works):

https://physicsinfootballgrade11bcss.weebly.com/energy-work-power.html

And provide a 250 word summary of the article and how it applies to the concepts of kinetic energy, work, and power. Also provide a description of how to figure kinetic energy, work, and power. If you can provide an additional resource. THIS HAS TO CONTAIN A SUMMARY OF THE ARTICLE AND BE RELATED TO THE ARTICLE OR I WILL NOT THUMBS UP!  If the 250 word summary meets all requirements I will thumbs up promptly.

A 2 cm high object is positioned 5 cm to the right of a converging lens (f= +3 cm). A diverging lens (f= -15 cm) is located 10 cm to the left of the converging lens. Determine its location and if the final image is inverted and virtual. Show ray tracing diagram to prove your answer.

Imagine you fill an insulated cup almost full with chopped or crushed ice, and measure the temperature after a minute or two, once it’s all come to thermal equilibrium. Since this ice is frozen water, the temperature should be at 0°C or not more than a couple of degrees below. Then, imagine you add a bunch of salt and stir it around.

What do you think the lowest temperature you can attain will be? Why? What happens to the amount of liquid present if you keep stirring and adding salt? How can we understand this phenomenon in terms of thermal and bond energy systems?

Develop an explanation for the changes you would observe in this physical system (decrease in temperature and change of phase) in terms of the Energy-Interaction Model. Preview the document

A photon with an initial wavelength of 1.070

Find the difference in the apparent acceleration of gravity at the equator and the poles, assuming the earth is spherical.

how do newton's three law of motion apply to an automobile? please include friction in your discussion.

A 55.4 ? resistor is connected in series with a 16.2 microF capacitor and a 60 Hz, 140 V source.

a) Find the current in the circuit. Answer in units of mA.

b) What is value of the inductor that must be inserted in the circuit to reduce the current to one half the previous current?

Answer in units of H.

5c.

Milly (mass 60.9 kg) runs at 4.11 m/s along the positive x-axis and then jumps onto a stationary 112 kg box. Milly and the box slide across the floor for distance 0.244 m, and then they come to a stop. Find the coefficient of kinetic friction between the box and the floor.

Why shift to digital television from analog? What are the shortcomings of analog TV and what are some of the advantages of digital? The specifications of digital television are set by the ATSC. Who are they and how do they specify the transmission? Please explain fully.

1. Please answer the following questions.

? What is the origin of electric resistance in material? Please give an argument to explain why capacitance depends on the geometry of the capacitor. (5%)

? Is Ampère’s law valid for the straight wire with finite length? Give an example to explain your answer using the Biot-Savart Law. (5%)

The energy we require to live comes from the chemically stored potential energy in food, which is transformed into other energy forms during the metabolism process. PHS 1120, Principles of Modern Physical Science 3 What consequence awaits a person whose combined work and heat output is less than the energy consumed? What happens when the person's work and heat output is greater than the energy consumed? Can an undernourished person perform extra work without extra food? Discuss and defend your answers. Please write a 5-paragraph essay connecting physical principles with biology. Include your responses to the questions above.

A motorcycle officer hidden at an intersection observes a car driven by an oblivious driver who ignores a stop sign and continues through the intersection at constant speed. The police officer takes off in pursuit 2.0 s after the car has passed the stop sign. She accelerates at 4.2 m/s^2 until her speed is 110 km/h, and then continues at this speed until she catches the car. At that instant,the car is 1.4km from the intersection. (a) How long did it take for the officer to catch up to the car? (b) How fast was the car traveling? (Ans:52 s, 98 km/h). Explain in detail how to solve.