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2 years ago

If a truck travels 100 miles in 2 hours, what is its speed?

Physics

2 answers:

densk [106]2 years ago

6 0

Answer:

50 miles/hr

Explanation:

$Distance = 100\: miles\\Time = 2\:hours\\\\Speed = \frac{Distance}{Time} \\\\Speed = \frac{100\:miles}{2\:hours}\\\\ Speed = 50\:miles/hour$

miskamm [114]2 years ago

5 0

Answer:50 miles per hour 50/1hr

Explanation:100 divided by 2 is 50, divide 2 by 2 thats 1

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A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wal

avanturin [10]

Answer:

$R_g=\frac{61}{7} =8.7143\ N$

$R_w=45.1857\ N$

Explanation:

Given that:

mass of plank, $m=3\ kg$

length of plank, $l=2\ m$

From the image we can visualize the given situation.

Consider the given plank to be mass-less and having a uniformly distributed mass of 1.5 kg per meter.

Now in the balanced condition:

$\sum F=0$

$R_g+R_w=(3+2.5)\times 9.8$

$R_g+R_w=53.9\ N$ .......................(1)

$\sum M_w=0$

$1.75\times R_g=3\times 1+(2.5\times 9.8)\times 0.5$

$R_g=\frac{61}{7} =8.7143\ N$ ...........................(2)

is the force acted by the tailgate on the plank.

Substitute the value from (2) into (1):

$R_w=45.1857\ N$ is the force acted by the wall upon the plank.

6 0

2 years ago

Recall that the volume V of a sphere of radius r can be computed using the formula. If the radius of a spherical balloon is incr

alekssr [168]

Answer:

Explanation:

Given that,

A sphere has a volume of V and a radius r

Volume of sphere cam be determine using the formula

V = 4/3 πr³

V = 4πr³ / 3.

If the radius of the sphere is increasing by

dr / dt = 5cm / min

How fast is the volume increasing when r = 10cm

dV / dt =?

From V = 4πr³ / 3

We can calculate dV/dr

dV/dr = 12πr² / 3

dV/dr = 4πr²

Then,

We want to find dV/dt

Using chain rule

dV/dt = dV/dr × dr / dt

dV/dt = 4πr² × 5

dV/dt = 20πr²

So, at r = 10

dV/dt { 20π × 10²

dV/dt = 6283.19 cm/min

The rate at which the volume increase is 6283.19 cm/min

6 0

2 years ago

A highly charged piece of metal (with uniform potential throughout) tends to spark at places where the radius of curvature is sm

k0ka [10]

Answer:

look it up

Explanation:

8 0

3 years ago

The pressure of a gas always decreases with decreasing temperature I need it for apex

Juliette [100K]

False. If you increase the temperature, the pressure will increase as well.

4 0

2 years ago

A xbox is rated at 0.15 kW. This xbox is used 10 hours per day. What is the cost using this xbox each month. Assume cost of elec

Nuetrik [128]

Answer:

A. 516 ¢ (**closet answer**)

Explanation:

xBox is rated 0.15 kW

in one day energy used will be 0.15kW ×10hr=1.5kwh

in 30 days energy used will be 1.5kwh×30=45kwh

rate of 1kwh is 11.42¢

so,rate for 45kwh will be 11.42×45 ≈514¢

3 0

2 years ago