The quadratic equation y = 0.0056x^2 + 0.14x represents a vehicle's stopping distance as a function of the vehicle's speed in kilometers per hour. a. Find the stopping distance for a vehicle traveling 100 km/h. b. Write an equation to find the speed of a vehicle that took 50 m to stop. Use a calculator graph or table to solve the equation.

Determine how far the vehicle travels in 3 hours.

• A helicopter travels 240 miles every 2 hours.

Repeat Previous Problem for a front-wheel-driven vehicle.

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Passengers in an auto traveling at 16.0 m/s toward the east hear a siren frequency of 950 Hz from an emergency vehicle approaching them from behind at a speed (relative to the air and ground) of 40.0 m/s The speed of sound in air is 340m/s. What frequency do the passengers in the auto hear after the emergency vehicle passes them?

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A $2800,\text{kg}$ space vehicle, initially at rest, falls vertically from a height of $3300 \mathrm{~km}$ above the Earth's surface. Find how much work is done by the force of gravity in bringing the vehicle to the Earth's surface.

Given $\frac{d y}{d x}=\frac{1}{y+2}$ $y(0)=0,$ deduce that $y=\sqrt{2 x+4}-2.$

Why is buying the correct size for an infant or child often difficult?

Find an example car (or other vehicle) battery, and compute how many of the AAA batteries in the previous problem it would take to equal the energy stored in it. Which is more compact?

(a) Calculate the change in entropy when 100 kJ of energy is transferred reversibly and isothermally as heat to a large block of copper at (i) $0 ^ { \circ } \mathrm { C }$, (ii) $50 ^ { \circ } \mathrm { C }$. (b) Calculate the change in entropy when 250 kJ of energy is transferred reversibly and isothermally as heat to a large block of lead at (i) $20 ^ { \circ } \mathrm { C }$, (ii) $100 ^ { \circ } \mathrm { C }$

Para cada uno de los verbos a continuación, trata de dar por lo menos un modismo que conozcas o que hayas oido. Luego escribe una oración con ese modismo. Puedes consultar un diccionario si es necesario.

MODELO

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Escribes meter la pata

Héctor metió la pata cuando dijo que Daniel le caia mal.

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