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How much heat transfer occurs from 20.0 kg of 90.0º C water placed in contact with 20.0 kg of 10.0º C water, producing a final temperature of 50.0º C? a) 5.0 × 10⁵ J b) 7.5 × 10⁵ J c) 1.0 × 10⁶ J d) 1.

Roberto Pinheiro asked Oct 17, 2024

by Roberto Pinheiro

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1 answer

3 votes

218k views

Light from a phosphorescent source: a. takes longer to travel from the source to you b. normally has a shorter wavelength than the light that initially produced it c. is cooler than light from a florescent

Omercnet asked Oct 17, 2024

by Omercnet

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1 answer

1 vote

176k views

Does the entropy of a star increase or decrease as it radiates? a)Increase b)Decrease c)No change d)Fluctuates

Bellu asked Oct 17, 2024

by Bellu

8.4k points

1 answer

0 votes

11.1k views

Calculate the fuel efficiency of a vehicle that can travel 350 km using 20l of gasoline include units in your answer

John U asked Oct 17, 2024

by John U

8.5k points

1 answer

5 votes

22.3k views

What is abbreviated W; the unit that measures how much electric energy is being used in one second?

Rob Rose asked Oct 17, 2024

by Rob Rose

7.9k points

1 answer

3 votes

95.1k views

A satisfactory radiograph was made without a grid using a 72-in. SID and 8 mAs. If the distance is changed to 40 in. and an 12:1 ratio grid is added, what should be the new milliampere-seconds value? 12

YdaetskcoR asked Oct 17, 2024

by YdaetskcoR

8.5k points

1 answer

5 votes

75.1k views

consider a light bulb with a filament made from tungsten (with a resistivity temperature coefficient of 4.5e-3/k). suppose the bulb is off, and at a temperature of 23 degrees c. then let the bulb be switched

Be Chiller Too asked Oct 17, 2024

by Be Chiller Too

8.4k points

1 answer

2 votes

96.2k views

In a dc generator, the brushes are in contact with_________: a) the field poles b) the commutator c) the rotor d) all of the above

Anis Ladram asked Oct 17, 2024

by Anis Ladram

8.5k points

1 answer

3 votes

231k views

Pre-Kepler heliocentric model of the solar system was no better than the geocentric model in predicting the location of planets because...

Loukan ElKadi asked Oct 17, 2024

by Loukan ElKadi

8.2k points

1 answer

2 votes

163k views

An oscillating LC circuit consisting of a 1.0 nF capacitor and a 3.7 mH coil has a maximum voltage of 2.6 V. What are (a) the maximum charge on the capacitor

Etranz asked Oct 17, 2024

by Etranz

8.3k points

1 answer

3 votes

107k views

The angular velocity of a point on a circle with a radius of 8 feet is 10π radians per second. What is the speed of the point? 1) 80 π ft/sec 2) 0.8 π ft/sec 3) 1.25 π ft/sec

Jark Monster asked Oct 17, 2024

by Jark Monster

8.2k points

1 answer

5 votes

51.2k views

A global angle is an angle with the positive x-axis (considered to be an angle of 0°), and the terminal angle as the angle formed after a counterclockwise rotation. What is the global angle of 20° south

Domecraft asked Oct 17, 2024

by Domecraft

7.8k points

1 answer

0 votes

190k views

Which of the models described below is least likely to produce reliable, reproducible results? a) A model for calculating interest rates versus economic growth b) A wind tunnel and a model airplane to

Mr Alpha asked Oct 17, 2024

by Mr Alpha

8.3k points

1 answer

3 votes

75.7k views

Explain why zwitterions can only form at the isoelectric point.

Frish asked Oct 17, 2024

by Frish

7.9k points

1 answer

3 votes

70.9k views

A car travel with a constant velocity of 45m/h for 20s.what distance does it cover?

Samuel Parkinson asked Oct 17, 2024

by Samuel Parkinson

8.9k points

1 answer

3 votes

4.7k views

If we make the approximation that all photons are emitted at the wavelength of peak intensity, how many photons per second does the body emit?

Drusolis asked Oct 17, 2024

by Drusolis

7.5k points

2 answers

3 votes

80.1k views

A car travels 20.0 km due north and then 95.0 km in a direction 60.0° west of north, as in Figure 1.15. Find the magnitude and direction of a single vector that gives the net effect of the car's trip.

Blueicefield asked Oct 17, 2024

by Blueicefield

8.0k points

1 answer

4 votes

8.5k views

John shot a bullet from his rifle with a speed of 650 m/s. How much time is needed for the bullet to strike a target 3900 m away? a) 6 seconds b) 10 seconds c) 15 seconds d) 6.5 seconds

Marius Fanu asked Oct 17, 2024

by Marius Fanu

7.4k points

1 answer

3 votes

202k views

A car leaves Gramton at 1639. It travels a distance of 315 km and arrives at Halfield at 2009 a) How long does the journey take? b) What is the car's average speed?

Naveen Prince P asked Oct 17, 2024

by Naveen Prince P

8.2k points

1 answer

5 votes

97.9k views

Consider a DC motor having a simplified transfer function, G(s)=3/s(s+3). a) First consider an open loop motor. What is the steady state error, e(t)=y(t)−x(t), due to a step input, x(t)=Au(t) ?

Vivek Patel asked Oct 17, 2024

by Vivek Patel

7.9k points

1 answer

1 vote

49.7k views

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