Physics, 09.09.2019 19:10 lilkobe6982

Awoman drives a car from one city to another with different constant speeds along the trip. she drives at a speed of 50.0 km/h for 25.0 min, 95.0 km/h for 20.0 min, makes a stop for 40.0 min, then continues at 40.0 km/h for 30.0 min, at which point she reaches her destination.
a) what is the total distance between her starting point and destination (in km)b) what is the avg speed for the entire trip in (km/h)

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Answer from: Haleysaraya1

A) 72.4 km

To calculate the total distance, we have to calculate the length of each part of the trip.

Part 1):

v = 50.0 km/h

t = 25.0 min = 0.42 h (25/60)

d_1 = vt=(50.0)(0.42)=21 km

Part 2):

v = 95.0 km/h

t = 20.0 min = 0.33 h (40/60)

d_2 = vt=(95.0)(0.67)=31.4 km

Part 3):

The woman stays constant for t = 40.0 min, so no distance covered in this part.

Part 4):

v = 40.0 km/h

t = 30.0 min = 0.5 h (30/60)

d_4 = vt=(40.0)(0.5)=20 km

So the total distance covered is

d=d_1 +d_2+d_4=21+31.4+20=72.4 km

B) 37.7 km/h

To find the average speed for the entire trip, we have to divide the total distance by the total time taken.

The total time taken is

t=25.0 + 20.0 +40.0 +30.0 =115.0 min

Converted into hours,

$t=\frac{115}{60}=1.92 h$

And the total distance is

d = 72.4 km

So the average speed is

$v=\frac{d}{t}=\frac{72.4}{1.92}=37.7 km/h$

Answer from: victory08

Explanation:

We should know that

Speed = distance traveled/time taken

S= d/t

Then,

d = S×t

distance = speed × time

A woman drives in a city with different speed

1. She drives at

50km/hr for 25mins

Distance = speed × time.

Distance = 50km/hr × 25/60 he

Distance. = 20.833km

2. 95km/hr for 20mins

Distance = s × t

distance = 95km/hr × 20/60 hr

Distance = 31.667km

3. She stopped for 40mins, with traveling

t = 40mins.

4. She continue at 40km/hr for 30mins

Distance = speed × time

distance = 40km/hr × 30/60

Distance = 20km

A. Total distance travelled

We are going to add all the distance traveled from one point to another

Total distance = 20.833 +31.667+20

Total distance = 72.5 km

B. Average speed?

Average speed is the total distance divided by the total time taken, the time she used to stop will be added.

Total time taken is

T = 25 + 20 + 40 + 30

T = 115 mins

T = 115/60 = 1.917 hr

So,

Average speed = total distance / total time taken

A.S = 72.5 / 1.917

A.S = 37.83 km/hr

Answer from: Quest

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles

b) 0.4 miles

c) 1 mile

d) 3.15 miles

Answer from: Quest

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.

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