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Sergio [31]
3 years ago
10

MATHPHYS PLEASE HELP IT SAYS ITS WRONG

Physics
2 answers:
Charra [1.4K]3 years ago
6 0
I can barely see the pic
jarptica [38.1K]3 years ago
3 0

Answer:

0.833 J

Explanation:

The initial kinetic energy of the spike is:

KE = ½ mv²

KE = ½ (0.52 kg) (3.7 m/s)²

KE = 3.56 J

23.4% of this energy is converted to internal energy.

U = 0.234 (3.56 J)

U = 0.833 J

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Electrical wire with a diameter of .5 cm is wound on a spool with a radius of 30 cm and a height of 24 cm.
kow [346]

Answer:

a)   # lap = 301.59 rad , b)   L = 90.48 m

Explanation:

a) Let's use a direct proportions rule (rule of three). If one turn of the wire covers 0.05 cm, how many turns do you need to cover 24 cm

          # turns = 1 turn (24 cm / 0.5 cm)

         # laps = 48 laps

Let's reduce to radians

        # laps = 48 laps (2 round / 1 round)

       # lap = 301.59 rad

b) Each lap gives a length equal to the length of the circle

          L₀ = 2π R

          L = # turns L₀

          L = # turns 2π R

          L = 48 2π 30

          L = 9047.79 cm

          L = 90.48 m

6 0
3 years ago
A car engine produces a force of 2000N while moving a distance of 200m in a time of 10s. What is the power developed by the engi
andreyandreev [35.5K]
Power = work/time
Work = force * distance

(2000 N * 200 m) / 10 s = 40,000 Joules
3 0
3 years ago
Which instrument is used to measure depth of ocean ?
skelet666 [1.2K]
Echo sounding is a type of SONAR used to determine the depth of water by transmitting sound pulses into water. The time interval between emission and return of a pulse is recorded, which is used to determine the depth of water along with the speed of sound in water at the time.
5 0
3 years ago
Greg is in a car at the top of a roller-coaster ride. The distance, d, of the car from the ground as the car descends is determi
Talja [164]
The solution to the problem is as follows:

 <span>Average = 80 
So Sum = 80 * 5 = 400 
Mode = 88, so two results are 88 (if three results were 88, then the median would be 88). 
Three results are 81, 88, and 88. 
That leaves 143. We could still have one 81 score, so that leaves the lowest score as 62. 

Greg is in a car at the top of a roller-coaster ride. The distance, d, of the car from the ground as the car descends is determined by the equation d = 144 - 16t2, where t is the number of seconds it takes the car to travel down to each point on the ride. How many seconds will it take Greg to reach the ground? 
d = 144 - 16t2 
0 = 144 - 16t2 
16t^2=144 
t^2=9 
t=3</span>
3 0
3 years ago
If it takes 15 minutes to dry your hair with a 1.200 kW hair drier, how much energy is used in drying your hair?
Elodia [21]
1.2 kW * 0.25 h = 0.300 kWh
6 0
3 years ago
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