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faltersainse [42]
3 years ago
5

calculate the momentum of 5.07 kg egg that is dropped from a roof and falls 2 seconds before hitting the ground.

Physics
1 answer:
inysia [295]3 years ago
8 0
Anything that's dropped on or near the Earth accelerates at the rate of
9.8 m/s² on its way down.  The mass of the object makes no difference. 
After falling for 2 seconds, it's falling at the rate of 19.6 m/s.

Momentum = (mass) x (speed)

The egg's momentum is   (5.07 kg) x (19.6 m/s) = 99.4 kg-m/s .
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the amount of surface area of the block contact with the surface is 2.03*10^-2*m2 what is the average pressure exerted on the su
CaHeK987 [17]

Complete question:

A block of solid lead sits on a flat, level surface. Lead has a density of 1.13 x 104 kg/m3. The mass of the block is 20.0 kg. The amount of surface area of the block in contact with the surface is 2.03*10^-2*m2, What is the average pressure (in Pa) exerted on the surface by the block? Pa

Answer:

The average pressure exerted on the surface by the block is 9655.17 Pa

Explanation:

Given;

density of the lead, ρ =  1.13 x 10⁴ kg/m³

mass of the lead block, m = 20 kg

surface area of the area of the block, A = 2.03 x 10⁻² m²

Determine the force exerted on the surface by the block due to its weight;

F = mg

F = 20 x 9.8

F = 196 N

Determine the pressure exerted on the surface by the block

P = F / A

where;

P is the pressure

P = 196 / (2.03 x 10⁻²)

P = 9655.17 N/m²

P = 9655.17 Pa

Therefore, the average pressure exerted on the surface by the block is 9655.17 Pa

6 0
3 years ago
What is the mass number of the missing daughter nuclei?
Nastasia [14]

Answer:

90

Explanation:

The mass number of the missing daughter nuclei can be obtained as shown in the attached photo.

6 0
3 years ago
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A string has an abrupt change in linear density at its midpoint so that the speed of a pulse on the left side is 2/3 of that on
goldenfox [79]

Answer:

Explanation:

a) Linear density is greater on the left side because the velocity of wave in a string is inversely proportional to the linear mass density of the string

b) We should start pulse from the left hand side so the reflected wave does not get inverted because the wave traveling from the denser to lighter medium gets reflected in the same phase.

3 0
3 years ago
An electric field around the rubbed balloon exerts a force that pulls the paper. Identify the contact forces and the field force
melamori03 [73]

Answer: the contact force is when you rub the balloon on a surface

Explanation:

4 0
2 years ago
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A particle with a charge of -4.0 μC and a mass of 3.2 x 10-6 kg is released from rest at point A and accelerates toward point B,
Assoli18 [71]

Answer:

V_B-V_A=-20736-0=-20736volt

Explanation:

We have given charge on the particle q=-4\mu C=-4\times 10^{-6}C

Mass of the charge particle m=3.2\times 10^{-6}kg

From energy of conservation kinetic energy will be equal to potential energy

So at point A

\frac{1}{2}mv^2=qV

At point a velocity is zero

So \frac{1}{2}(3.2\times10^{-6} )0^2=-4\times 10^{-6}V_a

V_A=0volt

At point B velocity will be 72 m/sec

So \frac{1}{2}\times 3.2\times 10^{-6}72^2=-4\times 10^{-6}V_b

V_B=-20736volt

So V_B-V_A=-20736-0=-20736volt

4 0
3 years ago
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