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4 years ago

10

During a transit, a

1 answer:

stich3 [128]4 years ago

8 0

Answer:

planet

Explanation:

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Gretchen runs the first 4.0 km of a race at 5.0 m/s. Then a stiff wind comes up, so she runs the last 1.0 km at only 4.0 m/s.

KIM [24]

Answer:

The velocity is $v = 4.76 \ m/s$

Explanation:

From the question we are told that

The first distance is $d_1 = 4.0 \ km = 4000 \ m$

The first speed is $v_1 = 5.0 \ m/s$

The second distance is $d_2 = 1.0 \ km = 1000 \ m$

The second speed is $v_2 = 4.0 \ m/s$

Generally the time taken for first distance is

$t_1 = \frac{d_1 }{v_1 }$

$t_1 = \frac{4000}{5}$

$t_1 = 800 \ s$

The time taken for second distance is

$t_1 = \frac{d_2 }{v_2 }$

$t_1 = \frac{1000}{4}$

$t_1 = 250 \ s$

The total time is mathematically represented as

$t = t_1 + t_2$

=> $t = 800 + 250$

=> $t = 1050 \ s$

Generally the constant velocity that would let her finish at the same time is mathematically represented as

$v = \frac{d_1 + d_2}{t }$

=> $v = \frac{4000 + 1000}{1050 }$

=> $v = 4.76 \ m/s$

7 0

4 years ago

in addition to studies of the body system of corals what studies in earth science might increased scientists understanding of an

Maru [420]

Answer: they could get a piece of the coral and run tests on it

Explanation:

6 0

3 years ago

Water enters an ice machine at 55F and leaves as ice at 25F. If the COP of the ice machine is 3.7 during this operation, determi

boyakko [2]

Answer:

The required power is $P_i = 0.2692 \ hp$

Explanation:

From the question we are told that

The temperature of the water entering ice machine is $T_1 = 55 ^o F$

The temperature of the water leaving is $T_2 = 25 ^oF$

The COP of the ice machine is $COP= 3.7$

The production rate of an ice $\r m = 15.0 \ lbm /hr$

The energy that needs to removed from each lbm of water at 55 F is $E = 169 Btu$

Generally the cooling load of the ice machine is mathematically represented as

$\r Q_L = \r m * E$

$\r Q_L =15 * 169$

=> $\r Q_L = 2535 \ Btu/h$

Generally the COP of the ice machine is mathematically represented as

$COP = \frac{\r Q_L}{P_i}$

Here $P_i$ is the net power input needed to successfully run the ice machine

So

$3.7 = \frac{2535}{P_i}$

=> $P_i = 685 \ Btu/h$

Converting to horsepower

$P_i = \frac{685}{2545}$

=> $P_i = 0.2692 \ hp$

3 0

3 years ago

Why could the beam of particles not have a neutral charge?

tino4ka555 [31]

Answer:

The positive and negative charges balance each other. Overall, the atom is uncharged (neutral). However, if something happens to make an atom lose or gain an electron then the atom will no longer be neutral. An atom that gains or loses an electron becomes an ion.

Explanation:

I think this is the answer : D

4 0

3 years ago

When sound is created it travels to the ear through a

kaheart [24]

Sound travels through the ear via compression

6 0

3 years ago

Read 2 more answers