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4 years ago

5

A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains cons

tant, what will be the reaulting current?

1 answer:

rosijanka [135]4 years ago

6 0

Answer:

1.2*1/3

Explanation:

Multiply the current by the volatage to get ur ans

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Imagine holding a basketball in both hands, throwing it straight up as high as you can, and then catching it when it falls. At w

valentina_108 [34]

Answer:before throwing and after catching the ball

Explanation:

When basketball is in the hand of player net force on it zero as holding force is canceled by gravity Force. During its entire motion gravitational force is acting on the ball which is acting downward. Even at highest point gravity is constantly acting downwards.

After catching the ball net force on it zero as holding force is canceled by gravity force and ball is continue to be in stationary motion.

6 0

3 years ago

A machine produces photo detectors in pairs. Tests show that the first photo detector is acceptable with probability 3/5. When t

klasskru [66]

Answer:

a. $a. \ \frac{7}{25}$

$b.\ \ \ P(D_1D_2)=\frac{6}{25}$

Explanation:

a. Find the probability that exactly one photo detector of a pair is acceptable:

Let $A_i=i^{th}$ photo is accepted and the probability $D_i=i^{th}$ is defected.

Therefore:

$P(A_i)=3/5,\ P(A_2|A_1)=4/5,\ \ P(A_2|D_1)=2/5\\\\\\=P(A_1D_2)+P(D_1A_2)\\\\=\frac{3}{5}\times\frac{1}{5}+\frac{2}{5}\times\frac{2}{5}\\\\=\frac{7}{25}$

#The probability of exactly one photo detector of a pair is accepted is 7/25

b.Find the probability that both photo detectors in a pair are defective,P(D1D2):

$P(D_1D_2)=\frac{2}{5}\times \frac{3}{5}\\\\=\frac{6}{25}$

Hence, from out tree diagram,the probability that both photo detectors in a pair are defective is 6/25

4 0

4 years ago

A car traveling at 80 kilometers per hour is passed by a second car going in the same direction at a constant speed. After 30 se

gulaghasi [49]

Answer:

= 38.89 m/s

Explanation:

speed of first car (u) = 80 km/h = 22.22 m/s

time (t) = 30 s

distance (d) = 500 m

find the speed of second car (v)

let the speed of the second car be represented as 'v'

We can get the speed of the second car from the formula net speed = distance between cars / time interval

where

distance between cars = 500 m
time interval = 30 s
net speed = v-22.22 (since both cars move in the same direction)

substituting the above into the formula we have

v-22.22 = 500 / 30

v = 500/30 + 22.22

v = 38.89 m/s

5 0

3 years ago

A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. T

solmaris [256]

Answer: Impulse is greater in the first case. So, option C is the correct option.

Explanation:

Case 1: Cart is travelling at 0.3 m/s and collide with an stationary object and after collision, cart rebound in opposite direction and another object remains in static condition.

Applying the conservation of linear momentum:

$m_{1} \times u_{1} + m_{2} \times u_{2} = m_{1} \times v_{1} + m_{2} \times v_{2}$

$m_{1} \times 0.3 + m_{2} \times 0 = m_{1} \times v_{1} + m_{2} \times 0$

Hence velocity of cart will rebound with the same velocity i.e. 0.3 m/s

Impulse is defined as the change in momentum

Impulse on the cart = $m_{1} \times v_{1} - m_{1} \times u_{1}$ = $m_{1} \times ((-3) - (3)) = m_{1} \times (-6)$ Kg m/s.

Case 2: Initially cart is travelling at 0.3 m/s and after collision it comes to rest.

So, change in momentum or Impulse = $m_{1} \times (0 - 3)$ = $-3 \times m_{1}$ Kg m/s.

Impulse is greater in the first case. So, option C is the correct option.

8 0

4 years ago

Read 2 more answers

Awning windows can be 100% openable and are best used where extreme weather conditions require a tight seal when the window is c

Jlenok [28]

Answer: True

Explanation: Awning windows

are Weather-tight, good choice in damp climates and can protect your home against moisture, even when they’re open during a rainstorm. Because of the way awning windows are constructed, they allow for nearly 100 percent of viable ventilation, without the threat of water seeping into the home. They also offer a superior seal against air pass through

These windows form a slant (of about 45 degree) after opening hence do not open 100%; this slant opening is advantageous in preventing rain from entering the building.

The windows can also be tightly sealed (from the inside) during extreme/cold weather conditions.

5 0

4 years ago