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tia_tia [17]
3 years ago
10

Helppppppppppppppp asappppppppppppp

Physics
1 answer:
vichka [17]3 years ago
8 0
The answer to the problem b.
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a 13kg block is at rest on a level floor. A 400 g glob of putty is thrown at the block so that the putty travels horizontally, h
stich3 [128]

Answer:

36.3m/s

Explanation:

We are given that

Mass of block, m=13 kg

Mass of glob,m'=400g=0.4 kg

1 kg=1000g

Total mass, M=13+0.4=13.4 kg

Distance, s=15 cm=0.15m

1m=100cm

Coefficient of sliding friction, \mu=0.4

We have to find the initial speed of the putty.

Friction force, f=\mu Mg=0.4\times 13.4\times 9.8N

Where g=9.8m/s^2

Work done=Fs

Work done=0.4\times 13.4\times 9.8\times 0.15

Work done=7.8792 J

Work done =K.E=1/2 MV^2

7.8792=\frac{1}{2}(13.4)V^2

V^2=7.8792\times 2/13.4=1.176

V=1.0844m/s

Using conservation of linear momentum

mu+ m'v=MV

13(0)+0.4v=13.4(1.0844)

0.4v=14.53

v=\frac{14.53}{0.4}

v=36.3m/s

Hence, the initial speed of the putty=36.3m/s

7 0
3 years ago
Why are metals good conductors of both heat and electricity?
serious [3.7K]
They are both good conductors if both heat and electricity due to the sea of delocalized electrons that is floating around without getting bonded to an atom.

Such electrons can flow around freely to conduct heat and electricity.
5 0
3 years ago
Is the ratio between the sine of an angle of incidence to the sine of an angle of refraction is called the refractive index?
motikmotik

Answer:

Yes

Explanation:

Yes it is called the refractive index denoted by n

n=sin<i/sin<r

6 0
3 years ago
Read 2 more answers
Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or
Stolb23 [73]

Answer:

I = (1.80 × 10⁻¹⁰) A

Explanation:

From Biot Savart's law, the magnetic field formula is given as

B = (μ₀I)/(2πr)

B = magnetic field = (1.0 × 10⁻¹⁵) T

μ₀ = magnetic constant = (4π × 10⁻⁷) H/m

r = 3.6 cm = 0.036 m

(1.0 × 10⁻¹⁵) = (4π × 10⁻⁷ × I)/(2π × 0.036)

4π × 10⁻⁷ × I = 1.0 × 10⁻¹⁵ × 2π × 0.036

I = (1.80 × 10⁻¹⁰) A

Hope this Helps!!!

3 0
4 years ago
A diver 40 m deep in 10 degrees C fresh water exhales a 1.5 cm diameter bubble.
zzz [600]

Answer:

0.0257259766982 m

Explanation:

P_2 = Atmospheric pressure = 101325 Pa

d_1 = Initial diameter = 1.5 cm

d_2 = Final diameter

\rho = Density of water = 1000 kg/m³

h = Depth = 40 m

The pressure is

P_1=P_2+\rho gh\\\Rightarrow P_1=101325+1000\times 9.81\times 40\\\Rightarrow P_1=493725\ Pa

From ideal gas law we have

\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow \dfrac{P_1\dfrac{4}{3\times8}\pi d_1^3}{T_1}=\dfrac{P_2\dfrac{4}{3\times8}\pi d_2^3}{T_2}\\\Rightarrow \dfrac{P_1d_1^3}{T_1}=\dfrac{P_2d_2^3}{T_2}\\\Rightarrow d_2=(\dfrac{P_1d_1^3T_2}{P_2T_1})^{\dfrac{1}{3}}\\\Rightarrow d_2=(\dfrac{493725\times 0.015^3\times (20+273.15)}{101325\times (10+273.15)})^{\dfrac{1}{3}}\\\Rightarrow d_2=0.0257259766982\ m

The diameter of the bubble is 0.0257259766982 m

8 0
3 years ago
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