Air can be considered a mixture. Which statement does not help explain why?

A steel drill making 180 rpm is used to drill a hole in a block of steel. The mass of the steel block and the drill is 180 g. If

SVETLANKA909090 [29]

Answer:

a) 37.8 W

b) 2 Nm

Explanation:

180 g = 0.18 kg

We can also convert 180 revolution per minute to standard angular velocity unit knowing that each revolution is 2π and 1 minute equals to 60 seconds

180 rpm = 180*2π/60 = 18.85 rad/s

We can use the heat specific equation to find the rate of heat exchange of the steel drill and block:

$\dot{E} = mc\Delta \dot{t} = 0.18*420*0.5 = 37.8 J/s$

Since the entire mechanical work is used up in producing heat, we can conclude that the rate of work is also 37.8 J/s, or 37.8 W

The torque T required to drill can be calculated using the work equation

$E = T\theta$

$\dot{E} = T\dot{\theta} = T\omega$

$T = \frac{\dot{E}}{\omega} = \frac{37.8}{18.85} = 2 Nm$

7 0

3 years ago

Aiden has basketball practice after school on Mondays, Wednesdays, and Fridays. He has practiced really hard this year to get be

Jlenok [28]

Ok I’ll help you I think 20 -192 = 1928172 then ur divided • by 181$1 then u get 244141551611671718181919191827337533535352526

6 0

3 years ago

How many years would it take to reach the planet saturn travelling at 21 thousand miles per hour? enter your answer with 2 decim

Dmitry_Shevchenko [17]

It would take about 4.8 years to travel from earth to Saturn.

<h3>How long would it take?</h3>

We know that speed is expressed as the ratio of distance to time. In this case, we are trying to know ow many years would it take to reach the planet Saturn travelling at 21 thousand miles per hour.

Given that;

Speed = 21 thousand miles per hour

time taken = ???

Distance = 887 million miles

Speed = distance/time

speed * time = distance

time = distance/speed

time = 8.87 * 10^8 miles/2.1 * 10^4 miles per hour

time = 4.22 * 10^4 hours

If 8.766 * 10^3 hours make 1 year

4.22 * 10^4 hours make 4.22 * 10^4 hours * 1 year/8.766 * 10^3

= 4.8 years

Learn more about Saturn:brainly.com/question/12181523

#SPJ1

8 0

1 year ago

An electric dipole with its center located at the origin of a Cartesian coordinate system oscillates along the x axis, creating

Ainat [17]

Answer:

The wave propagates on the z axis and the polarization is linear on the x axis

Explanation:

Part A

When the two dipole charges oscillate they form a fluctuating wave that propagates in the perpendicular direction, so if the oscillation of the magnetic field is on the axis and the propagation of the wave occurs on the z-axis.

The polarization of the electric wave is equal to the direction of the electric field, therefore as the field oscillates on the x-axis the polarization is also on the x-axis and is linearly polarized.

Part B

The wave propagates on the z axis and the polarization is linear on the x axis

5 0

3 years ago

At what condition do a coin and a feather fall together? What is the acceleration of the coin and feather at that instant? Justi

Dimas [21]

Answer:

If a coin and a feather are dropped from the same height at the same time on the moon’s surface, they fall together. Ans: It is because Gravity of the moon is six times less than that of the earth, therefore coin and a feather are fall together.

3 0

2 years ago