An athlete practicing for a track meet ran 400 meter in 50 seconds. What was his average speed?

A gas cylinder is filled with 4.00 moles of oxygen gas at 300.0 k. the piston is compressed to yield a pressure of 400.0 kpa. wh

Radda [10]

To answer this item, it is assumed that the gas in the cylinder is ideal such that it follows the equation,
PV = nRT
when V is to be calculated,
V = nRT/P
V = (4)(0.0821 L.atm/molK)(300 K) / (400 kPa/101.325 kPa/atm)
V = 24.95 L
Thus, the volume of gas in the cylinder is 24.95 L.

8 0

3 years ago

A certain aircraft can fly 612 miles with the wind in 3 hours and travel the same distance against the wind in 6 hours. What is

Andreas93 [3]

Answer:

51 mph

Explanation:

Given: A certain aircraft can fly 612 miles with the wind in 3 hours and travel the same distance against the wind in 6 hours.

Formula: $Speed=\dfrac{Distance}{Time}$

Let speed of aircraft be x mph and speed of wind y mph

Aircraft along wind:

Actual speed of aircraft = x + y

Time taken = 3 hours

Distance = 612 miles

$\therefore x+y=\dfrac{612}{3}$

$x+y=204----------(1)$

Aircraft against wind:

Actual speed of aircraft = x - y

Time taken = 6 hours

Distance = 612 miles

$\therefore x-y=\dfrac{612}{6}$

$x-y=102----------(2)$

By solving equation (1) and equation (2) and we get

x = 153 mph

y = 51 mph

Hence, The speed of wind will be 51 mph

6 0

3 years ago

The speed of sound through glass is 16344 km/hr. What is the wavelength of a sound wave of frequency 824 Hz in glass

SIZIF [17.4K]

Answer:

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

Explanation: i think this might help

8 0

3 years ago

Read 2 more answers

A converging lens has a focal length of 20 cm. An object 1 cm tall is placed 10 cm from the center of the lens. What is the heig

SCORPION-xisa [38]

Answer: 2 cm

Explanation:

Given , for a converging lens

Focal length : $f=20\ cm$