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3 years ago

10

A student measures the time it takes for two reactions to be completed reaction eight is completed and 57 seconds and reaction b

e is completed and 48 seconds what can about the rights of these reactions

1 answer:

Maslowich3 years ago

8 0

The answer to this problem is 1200

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The zone along the southern margins of the Sahara is called the

Jobisdone [24]

We have to choose the correct name for the zone along the southern margins of the Sahara. Laterite is a soil in hot and wet tropical areas. Savanna is the tropical grassland. It has tropical savanna climate. Veldt is name for the areas in the South Africa. Finally, the Sahel is the zone along the south margins of the Sahara. It has a semi-arid climate. The Arabic word "sahel" means "coast". Answer: C. Sahel. <span> </span>

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4 years ago

Which of the following can enter and exit an open system?

shutvik [7]

Answer:

The correct answer option is energy but not matter.

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2 years ago

A rock is thrown straight up into the air with an initial speed of 55 m/s at time t = 0. Ignore air resistance in this problem.

Alekssandra [29.7K]

Answer:

After 1.938 sec velocity of rock will be 36 m/sec

Explanation:

We have given initial velocity at which rock is thrown u = 55 m/sec

Final velocity v = 36 m/sec

Acceleration due to gravity $g=9.8m/sec^2$

According to first equation of motion we know that $v=u+gt$ , here v is final velocity, u is initial velocity, g is acceleration due to gravity and t is time

So $36=55-9.8t$ ( Negative sign is due to rock is thrown upward )

So $9.8t=19$

t = 1.938 sec

So after 1.938 sec velocity of rock will be 36 m/sec

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4 years ago

A fan blade, initially at rest, rotates with a constant acceleration of 0.029 rad/s2. What is the time interval required for it

LenKa [72]

Answer:

The time interval is $t = 21.30 \ s$

Explanation:

From the question we are told that

The constant acceleration is $\alpha = 0.029 \ rad / s^2$

The displacement is $\theta = 6.58 \ rad$

According to the second equation of motion we have that

$\theta = w_i* t + \frac{1}{2} * \alpha t^2$

given that the blade started from rest

$w_i$ which is the initial angular velocity is 0

So

$\theta = 0 + \frac{1}{2} * \alpha t^2$

=> $t = \sqrt{ \frac{2 * \theta }{\alpha } }$

substituting values

=> $t = \sqrt{ \frac{2 * 6.58 }{0.029 } }$

=> $t = 21.30 \ s$

6 0

4 years ago

A hiker moves 15 km due east then heads 8 km due west. What is the direction of the resultant vector?

ale4655 [162]

Answer:

east

Explanation:

15km east

_______________

X________

8km west

so you are where the xX is so you are still in the eastward direction

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4 years ago