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3 years ago

1 point

Physics

2 answers:

kogti [31]3 years ago

4 0

Answer:

51.17 is the answer pls give me brainlest

timama [110]3 years ago

3 0

51.17 km/hr because if you take 614 and divide it by 12 you would get the constant, or miles per hour. The answer you would get is 51.17(when rounded)

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A cart, which has a mass of m - 2.50 kg, is sitting at the top of an inclined plane which is 3.30 meters long and which meets th

SashulF [63]

Answer:

Part(i) the time taken for this cart to reach the bottom of the inclined plane is 1.457 s

Part(ii) the velocity of the cart when it reaches the bottom of the inclined plane is 4.531 m/s

Part(iii) the kinetic energy of the cart when it reaches the bottom of the inclined plane is 25.663 J

Explanation:

Given;

mass of the cart = 2.5 kg

angle of inclination, β = 18.5⁰

length of inclined plane = 3.3m

Part(i) the time taken for this cart to reach the bottom of the inclined plane

s = ut + ¹/₂×at²

initial vertical velocity, u = 0

s = 3.3 m

s = ¹/₂×at²

$t = \sqrt{\frac{2s}{a} }$

acceleration, of the cart, a = gsinβ

a = 9.8sin(18.5) = 3.11 m/s²

$t = \sqrt{\frac{2X3.3}{3.11 }}= 1.457 s$

Part(ii) the velocity of the cart when it reaches the bottom of the inclined plane

V = a×t

V = 3.11 × 1.457 = 4.531 m/s

Part(iii) the kinetic energy of the cart when it reaches the bottom of the inclined plane

KE = ¹/₂MV²

= ¹/₂ × 2.5× (4.531)²

= 25.663 J

6 0

4 years ago

Please somebody answer I desperately need help!

padilas [110]

Preserved fossil (like a fossil in amber, ice or tar.

8 0

4 years ago

Read 2 more answers

It takes 23 seconds to hoist a rescue diver of mass 80 kg from the ocean surface to a helicopter hovering 23.9 meters above the

tino4ka555 [31]

Answer:

840 W

Explanation:

The energy expended in hoisting the diver up is given by

$E = mgh$

m is the mass of the diver, g is the acceleration due to gravity and h is the height.

Using the values in the question and taking g as 9.8 m/s²,

$E = (80\text{ kg})\times (9.8\text{ m/s}^2)\times (23.9\text{ m}) = 18737.6\text{ J}$

The power is given by

$P = \dfrac{E}{t}$

t is the time.

Hence,

$P = \dfrac{18737.6\text{ J}}{23\text{ s}} = 841.678\ldots \text{ W}\approx 840\text{ W}$

4 0

3 years ago

2 b (ignore what I already completed)

posledela

Answer:

The answer for this question is it talks about the circuit containing the led, switch and all that

4 0

3 years ago

A rigid tank of air is cooled (temperature decreased) the volume has to remain constant because it is a rigid tank the air press

larisa [96]

If we consider Boyles law for gases, it states the following equation,
PV/T =k
where k is a constant
P-pressure, T- temperature and V -volume
the volume is constant at both situations as its a rigid tank as mentioned in the questions.
Therefore we consider Volume to be constant , then equation is
P/T = kV
kV = c (new constant)
P/T = c
P = cT
Therefore pressure is inversely proportional to temperature, whatever change in pressure would cause the same kind of change in temperature as well.
therefore when T decreases, P also decreases.
Answer is B

5 0

4 years ago