A non living factor in an ecosystem

In tae-kwon-do, a hand is slammed down onto a target at a speed of 10 m/s and comes to a stop during the 7.0 ms collision. Assum

wlad13 [49]

Answer:

(A) Impulse = 9Ns

(B) F = 1286N

Explanation:

Impulse = change in momentum = m(v-u)

v = 0 (the hand comes to a stop)

u = -10m/s

Mass = 0.9kg

Impulse = 0.9 ×(0- (-10))

= 9Ns

(B) F×t = Impulse

F = Impulse/ t

t = 7ms = 7×10-³

F = 9/ (7×10-³)

F = 1286N.

5 0

3 years ago

Please help and explain please thank youu

vekshin1

Answer:

2)

Series circuits = D & E

parallel circuits = C & F

3)

Circuit C is connected in parallel and circuit D is connected in series.

Circuit D and E are the same, despite the switch is located in a different position, they are working in series.

Circuits C and F are the same, they are connected in parallel.

There will be only one bulb in on mode and it is in the circuit F.

Explanation:

In the attached image, we can see a serial circuit and a parallel circuit. Serial circuits are characterized by sharing the same current, if the current step is interrupted (opening the switch), the current will not flow and no element (light bulbs off) will work. When a circuit is connected in parallel, they share the same voltage within the circuit. All resistive elements or bulbs are located between nodes 1 and 2, so they share the same voltage.

The special case are the circuits C and F, both are connected in parallel. But in circuit C the switch is near to the voltage source, therefore when the switch is unplugged there won't be the main current and the bulbs will be off.

In-circuit F, when the switch is off only the bulb near to the switch won't work the other bulb will be working because the main current is passing through it.

3 0

3 years ago

The power dissipated in a resistor is given by P = V 2 / R , which means power decreases if resistance increases. Yet this power

klasskru [66]

Answer:

Explanation:

Power Dissipated in a resistor is given by two methods i.e.

$P=\frac{V^2}{R}$ and

$P=I^2\cdot R$

where $V=Potential\ difference$

$R=resistor$

$I=current$

both formula gives Power but Former is used when voltage is constant i.e. when resistors are in parallel and the later is used when the resistor are in series .

Though $P=\frac{V^2}{R}$ can also be used in series but we have to calculate the Potential drop across each resistor then we can apply the formula.

Similar is with $P=I^2R$

First we have to calculate current through each resistor then we can apply the Formula

5 0

3 years ago

An energy pyramid illustrates that energy in the form of _____ is lost to the surroundings as it's passed from one organism to t

Dima020 [189]

The answer is metabolic heat.

<span>Organisms from the higher trophic levels consume organisms from the lower trophic level and during that process, energy is lost as metabolic heat. Primary producers (plants) contain the greatest amount of energy originally from the sunlight. The next trophic level belongs to primary consumers that consume primary producers. During consumption, energy is lost. Similarly, secondary consumers eat primary consumers and energy is lost again. The highest trophic level is tertiary consumers that contains the least amount of energy.</span>

5 0

4 years ago

A roofer drops a nail that hits the ground traveling at 26 m/s. How fast was the nail traveling 1 second before it hits the grou

ELEN [110]

This problem can be solved using a kinematic equation. For this case, the following equation is useful:

v_final = v_initial + at

where,
v_final = final velocity of the nail
v_initial = initial velocity of the nail
a = acceleration due to gravity = 9.8 m/s^2
t = time

First, we determine the time it takes for the nail to hit the ground. We know that the initial velocity is 0 m/s since the nail was only dropped. It has a final velocity of 26 m/s. We substitute these values to the equation and solve for t:

26 = 0 + 9.8*t
t = 26/9.8 = 2.6531 s

The problem asks the velocity of the nail at t = 1 second. We then subtract 1 second from the total time 2.6531 with v_final as unknown.

v_final = 0 + 9.8(2.6531-1) = 16.2004 m/s.

Thus, the nail was traveling at a speed of 16. 2004 m/s, 1 second before it hit the ground.

5 0

4 years ago