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3 years ago

The relationship between sharks and remoras is characterizedTRUE ORFALSE

1 answer:

8 0

False, sharks and remoras have a symbiotic relationship. The remora removes parasites from the sharks scales, and the shark provides protection for the remora

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A tank is 3 m long 1 m wide and 0.5 m deep is filled with oil which weighs 12000 N

Finger [1]

Area of the bottom = L x W = 3 x 1 = 3 square meters. Pressure = force/area = 12000/3 = 4000 N/square meter = 4 kPa. Since we know the weight of the oil, we don't need to know the depth.

5 0

3 years ago

A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.4 m/s2. (a) If the tension in the cord is 91

yanalaym [24]

Answer:8.125 kg

Explanation:

Given

deceleration of elevator $a=1.4\ m/s^2$

suppose T is the tension in the cord

therefore net force on lamp is

$F_{net}=T-mg$

$F_{net}=ma$

direction of a and g is in the same direction

$T-mg=m(1.4)$

$T=m(g+a)$

$m=\dfrac{T}{g+a}$

$m=\dfrac{91}{9.8+1.4}$

$m=8.125\ kg$

6 0

3 years ago

what is the initial velocity of a go-kart traveling at a uniform acceleration of 0.5 m/s^2 for 5s as it slows down to a stop?

timurjin [86]

The initial velocity of go-kart is 2.5 m/s.

Explanation:

Here, the uniform acceleration of go-kart is given as 0.5 m/s². Also the time required by it to stop is also given as 5 s. As acceleration is the measure of change in velocity per unit time.

In this case, the velocity should be changed from a value to zero to come to rest. So the initial velocity will be positive value and final velocity is zero.

As we know the values of acceleration, final velocity and time, the initial velocity can be easily determined as follows.

$Acceleration = \frac{Final velocity -Initial velocity}{Time}$

Since, final velocity is zero, acceleration is 0.5 m/s² and time is 5 s, then,

$-0.5=\frac{-\text {Initial velocity}}{5}$

Initial velocity = 0.5 × 5 = 2.5 m/s.

So the initial velocity of go-kart is 2.5 m/s.

8 0

3 years ago

An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the

aliina [53]

Answer:

Explanation:

we have to make charge inside the conductor zero because we know that electric field inside the conductor should be zero

so, the outer surface of the conductor should contain + 10 uC of charge and the inner surface contains -10 uC

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3 years ago

A wave has a wavelength of 5 meters and a frequency of 3 hertz. What is the speed of the wave?

otez555 [7]

A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 ... Find the speed of a wave with a wavelength of 5 m and a frequency of 68 Hz.

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3 years ago