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Natasha2012 [34]
3 years ago
5

a cannonball is fired with a speed of 76 m/s from the top of a cliff. It strikes the plane below with a speed of 89 m/s. if we n

eglect air friction, how high is the cliff
Physics
1 answer:
RSB [31]3 years ago
5 0

Answer:

we use the formula,

v {}^{2}  = u {}^{2}  + 2gh

89 {}^{2}  = 76 {}^{2}  + 2(10)h

h = (89 {}^{2}  - 76 {}^{2} ) \div 20

h= 107 m

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Romashka [77]

A_x = 5.0

A_y = -6.3

6 0
2 years ago
You push a box with a force of 80 n. if the net force on the box is 50 n, what is the force on the box due to sliding friction?
Elodia [21]

The force of the sliding friction is 30 N.

3 0
3 years ago
how much water is needed to produce 1kwh of electricity at a power plant that is 30% efficient if the temperature increase 10 C
Dimas [21]

The amount of water needed is 287 kg

Explanation:

The amount of energy that we need to produce with the power plant is

E=1 kWh = (1000W)(1h)=(1000W)(3600s)=3.6\cdot 10^6 J

We also know that the power plant is only 30% efficient, so the energy produced in input must be:

E_{in}=\frac{E}{0.30}=\frac{3.6\cdot 10^6}{0.3}=1.2\cdot 10^7 J

The amount of water that is needed to produce this energy can be found using the equation

E_{in}=mC\Delta T

where:

m is the amount of water

C=4186 J/kg^{\circ}C is the specific heat capacity of water

\Delta T=10^{\circ}C is the increase in temperature

And solving for m, we find:

m=\frac{E_{in}}{C\Delta T}=\frac{1.2\cdot 10^7}{(4186)(10)}=287 kg

Learn more about specific heat capacity:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

3 0
3 years ago
Name three characteristics of scientists that are important to their work but are also found in nonscientists.
Alina [70]

Answer:

The three characteristics of a good scientist are his curiosity, creativity and problem-solving skills.

Explanation:

3 0
3 years ago
Find the magnitude of the force at point x = 15cm if k=10500 N/m when the work done by this force is WD= 1/2k x2
Ann [662]

Answer:

sqdqk3

Explanation:

qdjqưbdkq ưqdhud j

6 0
3 years ago
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