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elena-s [515]
4 years ago
7

All the following statements about DC current are true except:

Physics
1 answer:
trapecia [35]4 years ago
6 0

Answer:

Is considered as not as dangerous as AC

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What force must the worker exert to get the box moving & what force must the worker exert to accelerate the box at 0.1 meter
photoshop1234 [79]

Since static friction is the minimum force required to just start the motion of a stationary object.

Here if we need to start an object from rest then we required F = 700 N

So for the first part of the above problem Force will be F = 700 N

Now if the box is already moving then we will have to use kinetic friction force between box and floor

now we can write the equation of net force as

F - F_k = m*a

here

F_k = kinetic friction = 220 N

m = mass = 500 kg

a = acceleration = 0.1 m/s^2

now we will have

F - 220 = 500* 0.1

F = 220 + 50 = 270 N

3 0
3 years ago
Chemical analysis of the oxygen isotopes in foraminifera shells allow scientists to create a climate record like the one shown h
IrinaK [193]
<span>Climatic changes can definitely influence changes in life forms.</span>
6 0
4 years ago
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How far (in feet) could a pitcher throw a baseball on flat, level ground if he can throw it at 100mph? (Neglect wind drag and th
ehidna [41]

Answer:

R = 668.19 ft  

Explanation:

given,

speed of the ball thrown by the pitcher = 100 mph

to travel maximum distance θ = 45°

distance traveled by the ball = ?

using formula

1 mph = 0.44704 m/s

100 mph = 44.704 m/s

R = \dfrac{u^2sin2\theta}{g}

R = \dfrac{44.704^2sin2\times 45}{9.81}

R = 203.71 m

1 m  = 3.28 ft

R = 203.71 × 3.28

R = 668.19 ft  

hence, ball will go at a distance of 668.19 ft   when pitcher throw it at 100 mph.

6 0
3 years ago
Which statement correctly identifies a difference between the function of most arteries and veins?
olasank [31]

Answer:a

Explanation:

8 0
3 years ago
Some of the minerals found in rocks dissolve in water as it flows over the rocks. would these minerals dissolve more quickly
densk [106]
A. Minerals would dissolve faster at the bottom of a waterfall than at a still pond because the water is more turbulent at the base of the waterfall.  The turbulent water has more energy and would facilitate faster dissolution of minerals. 

B. Minerals would dissolve faster in warmer water downstream because the warm water would speed up the rate of dissolution. 


C. Minerals in the sand would dissolve faster because the sand is in small grains and so more surface area is available for dissolution.  
7 0
3 years ago
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