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3 years ago

1. What is the velocity of an 250-kg that has 6,250 J of energy? Please help

Physics

1 answer:

leonid [27]3 years ago

6 0

Explanation:

KE = 1/2mv^2

6,250 J =1/2(250kg) v ^2

125kg. 125kg

v =

$\sqrt{50}$

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Calculate the pressure on a man’s foot when a woman who weighs 520 N steps on his foot with her heel which has an area of 0.001

Vinvika [58]

Answer:

520000 or 520000 pa

Force = 520N

Area of contact = 0.001

Pressure: 520000 or 520000

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2 years ago

A spherical weather balloon is filled with hydrogen until its radius is 4.40 m. Its total mass including the instruments it carr

ipn [44]

Answer:

4515.49484 N

4329.10484 N

Explanation:

r = Radius of balloon = 4.4 m

m = Mass of balloon with instruments = 19 kg

g = Acceleration due to gravity = 9.81 m/s²

Volume of balloon

$v=\frac{4}{3}\pi r^3\\\Rightarrow v=\frac{4}{3}\pi 4.4^3\\\Rightarrow v=356.8179\ m^3$

The Buoyant force = Weight of the air displaced

$F=\rho vg\\\Rightarrow F=1.29\times 356.8179\times 9.81\\\Rightarrow F=4515.49484\ N$

The buoyant force acting on the balloon is 4515.49484 N

Net force on the balloon

$F_n=F-W\\\Rightarrow F_n=4515.49484-19\times 9.81\\\Rightarrow F_n=4329.10484\ N$

The net force on the balloon is given by 4329.10484 N

As the balloon goes up the pressure outside reduces as the density of air decreases while the air pressure inside the balloon is high hence, the radius of the balloon tend to increase as it rises to higher altitude.

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2 years ago

What is used to measure the speed of a moving vehicle along the road

Romashka [77]

Answer:

Speedometer

Explanation:

Speedometer

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2 years ago

Read 2 more answers

If predators a and b prey upon the same species and predator a is eliminated

marysya [2.9K]

I would think Predator B would get more food from the species since Predator A was Eliminated.

For Example: if two dogs want the same bowl of food, they are going to fight or try and beat one another to it. So if Predator A is gone then Predator B has the species all to himself unsless another Predator comes.

Hope this helped!!

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3 years ago

Which circuit has the larger equivalent resistance: a circuit with two 10 ohm resistors connected in parallel or a circuit with

Ganezh [65]

Answer:

A circuit with two 10 ohm resistors connected in series.

Explanation:

The formula for the equivalent resistance for resistors in parallel is

$\frac{1}{Rt} = \frac{1}{R1} + \frac{1}{R2}$ So if R1=R2= 10 $\frac{1}{Rt} = \frac{1}{10} + \frac{1}{10} = \frac{2}{10} Rt =\frac{10}{2} =5 ohm$

The formula for the equivalent resistance for resistors in series is

Rt = R1 + R2 So Rt= 10 + 10 = 20

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3 years ago