PHYSICS HIGH SCHOOL

The device which disconnects the start winding in some split-phase motor circuits after a preset speed is obtained is thea. thermostat.
b. commutator.
c. brush spring.
d. relay.

Answers

Answer 1
Answer: a. thermostat. is the correct ans

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What do you think a black hole is

Answers


A black hole is a object with a gravitational pull so strong, you have to reach the speed of light to escape. Since nobody can, when it happens, we are gone.
A black hole contains a large amount of gravitational force, which pulls everything near it inside. 

Two tuning forks, 254 Hz. and 260 Hz., are struck simultaneously. How many beats will be heard?8

4

6

Answers


The longer you continue to listen, the more beats will be heard.

They'll occur at the rate of (260Hz - 254Hz) = 6 Hz .
 

Answer:

6.00 beats per second

Explanation:

Trên bóng đèn có ghi là 12v -6w. Khi đèn sáng bình thường thì dòng điện chạy qua đèn có cường độ là

Answers

Answer:

I=P/U=6/12=0.5(A)

Explanation: P=UI ( CÔNG SUẤT = HIỆU ĐIỆN THẾ NHÂN VỚI C Đ D Đ)

what environmental conditions might cause damage to the alveolar sacs, and what would be the consequences of that damage?

Answers

Following are the major environmental conditions that might cause a damage to the alveolar sacs:

1. Air pollution
2. Dust storms
3. Smog
4. Smoke

The aforementioned conditions can cause temporary or permanent damage to alveolar sacs. Damages may include: building up fluid in the sacs and accumulation of dust particles in the sacs. The consequences of that may include coughing or preventation of oxygen (air supply) into the lungs. 

A freight train completes its journey of 150 miles 1 hour earlier if its original speed is increased by 5 miles/hour. Give the original speed of the train. a. 20 miles/hour b. 25 miles/hour c. 30 miles/hour d. 35 miles/hour

Answers

The answer is B

If we assign speed  variable x; and time variable y; then;

xy=150

(y-1) (x+5) = 150

xy + 5y  - x – 5 = 150

(remember xy = 150), therefore;

5y – x = 5

X = 25

Y = 6
150(x+5)-150x=x(x+5)
150x+750-150x=x^2+5x
x^2+5x-750=0
(x-25)(x+30)=0
x=25

In order for an organism to develop specialized tissues the organism must be

Answers

Answer:

miuti celluar

Explanation:

Answer: It's multicellular (D)
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