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3 years ago

The momentuk of a 3000 kg truck is 64,300 kg at what velocity is the truck traveling

Physics

1 answer:

serious [3.7K]3 years ago

4 0

P=mv
p=momentum(643000) m=mass(3000) v=velocity

make equation equal to v

p/m=v
642000/3000= 214.33333

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Water, in a 100-mm-diameter jet with speed of 30 m/s to the right, is deflected by a cone that moves to the left at 14 m/s. Dete

podryga [215]

Answer:

Explanation:

The velocity at the inlet and exit of the control volume are same $V_i=V_e=V$

Calculate the inlet and exit velocity of water jet

$V=V_j+V_e\\\\V=30+14\\\\V=44m/s$

The conservation of mass equation of steady flow

$\sum ^e_i\bar V. \bar A=0\\\\(-V_iA_i+V_eA_e)=0$

$A_i\ \texttt {is the inlet area of the jet}$

$A_e\ \texttt {is the exit area of the jet}$

since inlet and exit velocity of water jet are equal so the inlet and exit cross section area of the jet is equal

The expression for thickness of the jet

$A_i=A_e\\\\\frac{\pi}{4} D_j^2=2\pi Rt\\\\t=\frac{D^2_j}{8R}$

R is the radius

t is the thickness of the jet

D_j is the diameter of the inlet jet

$t=\frac{(100\times10^{-3})^2}{8(230\times10^{-3}} \\\\=5.434mm$

(b)

$R-x=\rho(AV_r)[-(V_i)+(V_c)\cos 60^o]\\\\=\rho(V_j+V_c)A[-(V_i+V_c)+(V_i+V_c)\cos 60^o]\\\\=\rho(V_j+V_c)(\frac{\pi}{4}D_j^2 )[V_i+V_c](\cos60^o-1)]$

$1000kg/m^3=\rho\\\\44m/s=(V_j+V+c)\\\\100\times10^{-3}m=D_j$

$R_x=[1000\times(44)\frac{\pi}{4} (10\times10^{-3})^2[(44)(\cos60^o-1)]]\\\\=-7603N$

The negative sign indicate that the direction of the force will be in opposite direction of our assumption

Therefore, the horizontal force is -7603N

7 0

3 years ago

If a person’s mass is 85kg. What is his weight?

lara [203]

The force by which earth attracts anobject is know as weight of that particular object.

so,

=》weight ( F ) = mass ( M ) × acceleration ( A )

=》F = 85 × 9.8

( because acceleration due to gravity = 9.8, but sometimes it is taken as approx 10 )

=》F = 833 Newton.

note : if you take acceleration due to gravity as 10 then the weight of the person = 85 × 10 = 850 N )

i hope it helped.....

3 0

3 years ago

Hannah drove 360 mi in 5.2 hours. What was her average speed?

ANTONII [103]

Her average speed would be 69.2 miles per hour

Explanation:
When you take the number of miles and divide it by the number of hours you get 69.2 (when rounded)
That is how fast she went per hour

5 0

3 years ago

The chewing muscle, the masseter, is one of the strongest in the human body. It is attached to the mandible (lower jawbone) as s

kifflom [539]

Answer:

Explanation:

Check attachment