Question:
Teresa drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 12 hours. When Teresa drove home, there was no traffic and the trip only took 8 hours. If her average rate was 20 miles per hour faster on the trip home, how far away does Teresa live from the mountains?
Do not do any rounding.
Answer:
480 miles
That is Teresa lives 480 miles from the mountains
Explanation:
Here we have
Distance D = Speed S × Time t
On her way to the mountain we have
D = S × 12
On her way back we have
D = (S +20)×8
Therefore, by comparing the two above equations, we have
S × 12 = (S +20)×8
Therefore, 12·S = 8·S +160 or
4·S = 160
Hence S = 160/4 = 40 miles/hour
Therefore, from D = S × 12, we have
D = 40 × 12 = 480 miles.
Answer:
Hello! Here are your answers!
SCALAR: Scalar quantities have a size or magnitude only.
VECTOR: Vector quantities have both magnitudes and direction.
Explanation:
They are alike as they are both used to explain physical quantities and represent the magnitudes or sizes of the physical quantities...
They are different as VECTOR quantities describe an objects DIRECTION as well as magnitude whilst SCALAR doesn't
ie...<u>SCALAR:</u> MASS, TIME
<u>VECTOR:</u> VELOCITY, ACCELERATION...
I HOPE THIS HELPS!!
Answer:
Explanation:
2. 330.63 ft because v*t=d and 3.09*107=330.63
3. 4.2 because 10/2.4=4.1666
4. 130 miles because 2 hours times 65mph= 130
5. 62.3 seconds because 480000/7700=62.33766233
8. 60 meters, because 0.5 *120 (because 2 minutes converted to seconds is 120) is equal to 60.
Answer:
Explanation:
According to Newton's laws of gravitation force of attraction is given by
F = GMm/R²
G = 6.67 X 10⁻¹¹
,M = 2.5 Kg ,
m = 2.5 Kg ,
R = .14 m
=
F = 6.67 X 10⁻¹¹ X 2.5 X 2.5 / 0.14²
= 2126.9 X 10 ⁻¹¹ N.
N - adica Newtonul.
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