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liraira [26]
3 years ago
8

HELP ITS FOR SCIENCE

Physics
2 answers:
yuradex [85]3 years ago
7 0
For number 2:
Speed is related to kinetic energy because kinetic energy is the energy of motion.

Hope this helped!
Rashid [163]3 years ago
7 0

Answer:

A wrecking ball has the capability to destroy a building due to the greater mass and kinetic energy than the yo-yo.

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What is the speed of sound in air at 40°C? 355 m/s 307 m/s 331 m/s 239 m/s
abruzzese [7]
The ans is A. 355 m/s as temperature is above stp
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3 years ago
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4) An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y dir
Maurinko [17]

Answer:

B) along the -z-axis.

Explanation:

  • According to the Fleming's left hand rule we know that when a positive charge moves with velocity v perpendicular to the direction of magnetic field the it experiences a magnetic force perpendicular to the the plane in which the velocity vector and the magnetic field vector lies.
  • As a result all the three vector are mutually perpendicular in such a case.
  • Here as per given condition we have a negative charge moving along x-axis which experiences the deflection in -y direction so the magnetic field will be along the negative z axis i.e. into the screen.
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4 years ago
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What type of weather system brings calm, clear weather?
liq [111]
A High Pressure System 
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3 years ago
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A machine is supplied Energy at a rate of 4000 W and does useful work at a rate of 3760 W. What is the efficiency of the machine
ICE Princess25 [194]
The efficiency of a machine is the ratio between the output power and the power in input:
\epsilon =  \frac{P_{out}}{P_{in}}
in our problem, the output power is 3760 W while the input power is 4000 W, so the efficiency is
\epsilon =  \frac{3760 W}{4000 W} =0.94
So the efficiency of the machine is 94%.
6 0
3 years ago
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In the sum A→+B→=C→, vector A→ has a magnitude of 13.6 m and is angled 40.2° counterclockwise from the +x direction, and vector
il63 [147K]

Answer:

|B|=27.00425726m

\alpha =210.3781372°

Explanation:

Let's use the component method of vector addition:

A_x=13.6cos(40.2)=10.38762599\\A_y=13.6sin(40.2)=8.778224553\\Cx=13.8cos(20.7+180)=-12.90912763\\Cy=13.8sin(20.7+180)=-4.877952844

Now, we know:

C_x=A_x+B_x\\\\C_y=A_y+b_y

So:

B_x=C_x-A_x=-23.29675362\\B_y=C_y-A_y=-13.6561774

Now lets calculate the magnitude of the vector B:

|B|=\sqrt{(B_x)^{2} +(B_y)^{2}  }=27.00425726m

Finally its angle is given by:

\alpha =(arctan(\frac{B_y}{B_x}))+180=30.37813438+180=210.3781344°

Keep in mind that I added 180 to the angles of C and B to find the real angles measured from the + x axis counter-clock wise.

8 0
3 years ago
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