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Jobisdone [24]
3 years ago
8

A piece of metal is 4 cm by 10 cmby 2 cm. Find its mass if it has adensity of 2 g/cm'.​

Physics
1 answer:
harina [27]3 years ago
3 0

Answer:

m=ρV

V=LxWxD

V=4x10x2=80

m=2*80=160 grams

Explanation:

Mass is equal to density multiply by volume of object. Volume of rectangle pice can be calculated by multiplying all sides.

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10. Hamilton How long does it take Lewis travelling at 156 m.p.h to cover 16 miles?
Anvisha [2.4K]

Answer: Hello!

Lewis is travelling at 165 mph, which means miles per hour, this says that he does 165 miles in one hour.

We want to know how much time takes to cover 16 miles.

this can be calculated as the quotient of the distance and the velocity; this is:

t = \frac{16 mi}{165 mi/h} = 0.096 h

if we want to write this in minutes, then:

we know that one hour has 60 minutes, then 0.096 hours has:

0.096h*60mins/1h = 5.8 minutes.

then Lewis needs 5.8 minutes in order to cover 16 miles if his speed is 156 miles per hour.

6 0
3 years ago
Read 2 more answers
In Fig.25-46,how much charge is stored on the parallel-plate capacitors by the 12.0 V battery? One is filled with air,and the ot
Fittoniya [83]

Answer:

Q=7.9\times 10^{-10}\ C

Explanation:

Given that

V= 12 V

K=3

d= 2 mm

Area=5.00 $ 10#3 m2

Assume that

$ = Multiple sign

# = Negative sign

A=5\times 10^{-3}\ m^2

We Capacitance given as

For air

C_1=\dfrac{\varepsilon _oA}{d}

C_1=\dfrac{\varepsilon _oA}{d}

C_1=\dfrac{8.85\times 10^{-12}\times 5\times 10^{-3}}{2\times 10^{-3}}

C_1=2.2\times 10^{-11}\ F

C_2=\dfrac{K\varepsilon _oA}{d}

C_2=\dfrac{3\times 8.85\times 10^{-12}\times 5\times 10^{-3}}{2\times 10^{-3}}\ F

C_2=6.6\times 10^{-11}\ F

Net capacitance

C=C₁+C₂

C=8.8\times 10^{-11}\ F

We know that charge Q given as

Q= C V

Q=12\times 6.6\times 10^{-11}\ C

Q=7.9\times 10^{-10}\ C

6 0
3 years ago
Avi, a gymnast, weighs 40 kg. She is jumping on a trampoline that has a spring constant value of 176,400 . If she compresses the
viva [34]

<u>Answer</u>

9 m


<u>Explanation</u>

The energy stored in a spring is given by:

Energy = 1/2 k²e

Where e is the compression and k is the spring constant.

 Energy = 1/2 × 176,400 × 0.2²

              = 3,528 N

The same energy will then be converted to potential energy given by:

Energy = mgh

Where m is the mass, g is the gravity and h is the height above the ground.

Energy = mgh

3,528 = 40 × 9.8 × h

3,528 = 392h

h = 9 m

3 0
3 years ago
Read 2 more answers
What is the distance to school if it took bob 1 hour to get to it going at the speed of 1 km/h.
astraxan [27]

Answer:

1 km

Explanation:

Bob travels at one km/h and it takes him one hour to get there.

6 0
3 years ago
Read 2 more answers
A concentrated vertical laod of 6000 lbf is applied at the ground suface most nearly what is the increase in the vertical pressu
drek231 [11]

Answer:

the correct answer is option A

Explanation:

given,

Load = 6000 lbf            

depth = 3.5 ft                                      

distance from the load = 4 ft                  

vertical stress = \dfrac{3Pz^3}{2\pi (r^2+z^2)^{\frac{5}{2}}}

                        = \dfrac{3\times 6000\times 3.5^3}{2\pi (4^2+3.5^2)^{\frac{5}{2}}}

                        = 28.96 lbf/ft²                      

                        = 29 lbf/ft²              

hence, the correct answer is option A

5 0
3 years ago
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