How much work is done when you push a crate horizontally with 130 N across a 5.0-m

A 100 kg boat is floating in water. half of the boat is submerged under water. what is the weight of the boat?

Alex17521 [72]

W=MG
w is weight
m is mass
g is gravity
W=(100 kg)(9.8 m/s)
W= 980 N
hope this helps

7 0

3 years ago

A group of rescue workers is rescuing a dog from a condemned building. Due to demolition, the building has no stairs leading to

zaharov [31]

Answer:

Minimize the elevation or jump distance

Explanation:

The only action that minimizes, the impact force is to reduce as much as possible the height of the jump, the dog, ie the height from the jump point of the building. Since at the time of the jump its speed will increase every second at the rate of 9 [m/ s], that is this low effect of the gravitational acceleration of 9 [m/s^2]

$v_{f}=\sqrt{2*g*h}$

where:

vf = final velocity [m/s]

g = gravity [m/s^2]

h = elevation [m]

As we can see while there is higher height, at a higher speed will impact the ground.

6 0

4 years ago

Akeem is walking on the beach on a hot summer day.

creativ13 [48]

Answer:

Sand in a beach is warmer than the water of the sea.

Explanation:

Water absorbs less heat from the sun when compared with sand. Sand is darker and also is less reflective. Because of its darker nature, absorption of heat from the sun will be more. Due to its less reflective nature the sand wouldn’t be able to reflect off the sunlight.

But water is highly reflective and can reflect off a major portion of the sunlight falling on the sea. The sea is also deep and thus the heat spreads through a large volume unlike in the case of sand. Water also has the nature of constant movement unlike sand which is stable.

This factor also heats up sand more than water. 

8 0

3 years ago

7. A neutron at rest decays (breaks apart) into a proton and an electron. Energy is released in the decay, in the form of kineti

kondaur [170]

Answer:

The fraction of the total energy goes into kinetic energy of proton is $5.44 \times 10^{-4}$

Explanation:

Given:

Mass of proton $m_{p} = 1836 m_{e}$

Mass of electron $m_{e} = 9.1 \times 10^{-31}$ kg

Here neutron at rest decays into proton and electron

$n_{1} ^{0}$ ⇄ $P_{1} ^{1} + e_{0} ^{-1} + Q$

Where $Q =$ energy released

The $Q$ value of this reaction is given by

$Q = (\frac{m_{p} +m _{e} }{m_{e} } ) K$

Where $K =$ kinetic energy of reaction

Here we need to find fraction of the total energy released goes into the kinetic energy of the proton

$\frac{K}{Q} = \frac{m_{e} }{m_{p} + m_{e} }$

$\frac{K}{Q} = (\frac{m_{e} }{1836m_{e} + m_{e} } )$

$\frac{K}{Q} = \frac{1}{1837}$

$\frac{K}{Q} = 5.44 \times 10^{-4}$

Therefore, the fraction of the total energy goes into kinetic energy of proton is $5.44 \times 10^{-4}$

6 0

3 years ago

A. Some materials exhibit the property of superconductivity under certain conditions.

Vlada [557]

Answer:

Conditions for Superconductivity

The material must be cooled below a characteristic temperature, known as its superconducting transition or critical temperature (Tc). ... The magnetic field to which the material is exposed must be below a characteristic value known as the critical magnetic field (Hc).

7 0

3 years ago