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Licemer1 [7]
4 years ago
11

A man runs for an hour and a half at 8 miles an hour due south. He then continues south on a bus traveling at 55 miles an hour f

or 24 minutes. How far did he travel?
Physics
1 answer:
bezimeni [28]4 years ago
3 0

Answer:34 miles

Explanation:

Given

Man runs for t_1=1.5\ hr to south with speed v_1=8\ mph

He then continues south for t_2=24\ minutes\approx 0.4\ hr with speed v_2=55\ mph

Total distance traveled d=v_1\times t_1+v_2\times t_2

d=8\times 1.5+55\times 0.4

d=12+22

d=34\ miles

thus he travels a distance of 34\ miles due to south

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What factors does not influence the rate of chemical weathering?
Svetradugi [14.3K]

Answer:

Exposure to the Atmosphere

Composition of Rock

Surface area of the rock

Climate

Time

Explanation:

Exposure to the Atmosphere - how much of the rock mass is exposed to the environment affects how quickly the rock will be weathered by that very environment

Composition of Rock - what kind of minerals the rock is made of, how easy it is for those minerals to disintegrate and how quickly the react with water and air.

Surface area of the rock - a rick that has a wider surface or smaller pieces is more exposed than one that is a lump. A larger surface area increases the rate of weathering

Climate - if a rock is an area where there are high temperatures or very low temperatures, the rate of weathering is likely to increase. A similar point can be made about a region that experiences a lot of rain.

Time - the longer the rock is exposed to harsh conditions, the more it will experience weathering

4 0
3 years ago
Can an object with acceleration of zero be in motion?
BabaBlast [244]

Answer:

NO

Explanation:

if it has no acceleration then it's not moving

3 0
3 years ago
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Lars is standing near the edge of a 90-meter cliff. He throws a ball upward, but does not catch it, and it falls to the bottom o
Kipish [7]

Answer:

c. 43 m/s

Explanation:

Given the following data;

Displacement, S = 90 meters

Time, t = 5.55 seconds

To find the initial velocity;

We would use the second equation of motion given by the formula;

S = ut + \frac {1}{2}at^{2}

Where;

  • S represents the displacement or height measured in meters.
  • u represents the initial velocity measured in meters per seconds.
  • t represents the time measured in seconds.
  • a represents acceleration measured in meters per seconds square.

We know that acceleration due to gravity is -9.8m/s² because the direction is downward.

Substituting into the equation, we have;

90 = u*5.55  + \frac {1}{2}*(-9.8)*5.55^{2}

90 = u5.55 - 4.9*30.8025

90 = u5.55 - 150.93225

Rearranging the equation, we have;

u5.55 = 90 + 150.93225

u5.55 = 240.93225

u = \frac {240.93225}{5.55}

Initial velocity, u = 43.41 ≈ 41 m/s

4 0
3 years ago
What is the distance covered when the speed is 960km/hr and time is 1 hour and 50 minutes?
OLEGan [10]
The distance is 1760 km

The speed is 960 km hour I.e 960 divide by 60 = 16 km/minute
hence in time 1 hour 50 minutes I.e 110 minutes
distance travelled is 110 - 16 = 1760 km
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3 years ago
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