3 years ago

PLEASE HELP ME!!! I DON’T KNOW HOW TO DO THIS

1 answer:

8 0

It looks like it's wanting you to find speed and velocity
these formula's should help
speed=distance/time
velocity=overall distance/time

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A 30-kg block of ice at 0° C is sliding on a horizontal surface. The initial speed of the ice is 6.1 m/s and the final speed is

S_A_V [24]

Answer:0.748 gm

Explanation:

Given

mass of block =30 kg

initial velocity=6.1 m/s

Final velocity=4.5 m/s

Change in kinetic Energy $=\frac{mv_i^2}{2}-\frac{mv_f^2}{2}$

$\Delta KE=254.4 J$

Change in kinetic energy =heat generated by friction=heat absorbed by ice

$L=3.4\times 10^5 J/kg$

$254.4=m\times 3.4\times 10^5$

m=0.748 gm

7 0

4 years ago

La distancia entre dos ciudades es de 350km.Si un autocar emplea 4h en el viaje,determina su velocidad media y exprésala.En el s

Oxana [17]

Answer:

v = 87.5 km/h

Explanation:

To find the speed of the car you use the following formula:

$v=\frac{x}{t}$ (1)

x: distance traveled by the car = 350km

t: time = 4h

you replace the values of x and t in the equation (1):

$v=\frac{x}{t}=\frac{350km}{4h}=87.5\frac{km}{h}$

hence, the speed of the car is 87.5km/h

4 0

3 years ago

slader A steel bar is 150 mm square and has a hot-rolled finish. It will be used in a fully reversed bending application. Sut fo

allochka39001 [22]

Answer:

(a) 98.548 mPa

(b) N = 942346

9.42 X 10∧5 cycles

Explanation:

The solved solution is in the attach document.

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4 years ago

Don't take your heart rate with your thumb because the thumb has it's own pulse.

pogonyaev

Explanation:

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3 years ago

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$F = \frac{\mu_0 I_1I_2 }{2\pi d}$