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3 years ago

A ball is dropped off the side of a bridge after falling 1.55 s, what is its velocity.

Physics

1 answer:

Scorpion4ik [409]3 years ago

9 0

Answer:

v = 15.19 m/s

Explanation:

As we know that when object is dropped from some height then initial speed of the object is taken as

$v_i = 0$

now for the final speed of object we can say that if acceleration is constant then the final speed will be given by kinematics equation

$v_f = v_i + at$

here we have

$a = 9.8 m/s^2$ (due to gravity)

now from this equation of motion

$v_f = 0 + (9.8)(1.55)$

$v_f = 15.19 m/s$

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A 1 m long wire of diameter 1mm is submerged in an oil bath of temperature 25-degC. The wire has an electrical resistance per un

Zarrin [17]

Answer:

steady state temperature =88.7deg C

t=time within 1 deg C of it steady state is 8.31s

Explanation:

A 1 m long wire of diameter 1mm is submerged in an oil bath of temperature 25-degC. The wire has an electrical resistance per unit length of 0.01 Ω/m. If a current of 100 A flows through the wire and the convection coefficient is 500W/m2K, what is the steady state temperature of the wire? From the time the current is applied, how long does it take for the wire to reach a temperature within 1-degC of the steady state value? The density of the wire is 8,000kg/m3, its heat capacity is 500 J/kgK and its thermal condu

The diameter of the wire is known to be=1mm

properties=

The density of the wire is 8,000 kg/m3,

heat capacity is 500 J/kgK

themal conductivity is 20W/m.K

electrical resistance per unit length of 0.01 Ω/m

from lump capavity method

$B_{i} =\frac{hr/2}{k}$

500*(2.5*10^-4)/20

0.006<0.1

we know also, to find steady state temperature

$\pi$ Dh(T-Tinf)= $I^{2} R_{e}$

make T the subject of the equation , we have

T=25+ $\frac{100^2*0.01}{\pi*0.001*500 }$

T=88.7 degC

rate of chnage in temperature

dT/dt= $\frac{I^2*Re}{rho*c*\pi*D^2/4 } -\frac{4h}{rho*c*D} (T-Tinf)$

at t=o and integrating both sides $\frac{T-Tinf-(I^2*Re/\pi*Dh) }{Ti-Tinf-(I^2*Re/\pi*Dh } =exp\frac{-4ht}{rho*c*D}$

we have

$\frac{87.7-25-63.7}{25-25-63.7} =exp\frac{4*500t}{8000*500*0.001}$

t=8.31s

steady state temperature =88.7deg C

t=time within 1 degC of it steady stae is 8.31s

7 0

3 years ago

If an object's kinetic energy is zero, what is its momentum?

hammer [34]

If the object's kinetic energy is zero, then due to in multiplication factor, it's momentum will also be equal to zero 'cause the velocity of the object must be Nil

In short, Your Answer would be: "Zero"

Hope this helps!

6 0

3 years ago

What are examples of chemical energy

klio [65]

-- the big flash of light and heat coming out of the head
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3 years ago

A student investigated how the mass of water in an electric kettle affected the time taken for the water to reach boiling point.

Sedbober [7]

Answer:

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3 years ago

In order to be considered a vector, a quantity must include what two components? A. Magnitude

shepuryov [24]

In order to be considered a vector, a quantity must include Magnitude (A) and Direction (D).

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3 years ago

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