Answer:
C. The wheel with spokes has about twice the KE.
Explanation:
Given that
Mass , radius and the angular speed for both the wheels are same.
radius = r
Mass = m
Angular speed = ω
The angular kinetic energy KE given as

I=Moment of inertia for wheels
Wheel made of spokes
I₁ = m r²
Wheel like a disk
I₂ = 0.5 m r²
Now by comparing kinetic energy



KE₁= 2 KE₂ 
Therefore answer is C.
 
        
             
        
        
        
Answer: 4575N
Explanation:
For y component, W = mgcosø
W = 500×9.8cos21
W = 4574.54N
Find the diagram in the attached file
 
        
             
        
        
        
Answer:

Explanation:
The total energy of the satellite when it is still in orbit is given by the formula

where
G is the gravitational constant
m = 525 kg is the mass of the satellite
 is the Earth's mass
 is the Earth's mass
r is the distance of the satellite from the Earth's center, so it is the sum of the Earth's radius and the altitude of the satellite:

So the initial total energy is

When the satellite hits the ground, it is now on Earth's surface, so

so its gravitational potential energy is

And since it hits the ground with speed

it also has kinetic energy:

So the total energy when the satellite hits the ground is

So the energy transformed into internal energy due to air friction is the difference between the total initial energy and the total final energy of the satellite:

 
        
             
        
        
        
The speed is 0.956 m / s.
<u>Explanation</u>:
The kinetic energy is equal to the product of half of an object's mass, and the square of the velocity.
                    K.E = 1/2  m
 m  
 
where K.E represents the kinetic energy,
            m represents the mass,
             v represents the velocity. 
                   K.E = 1/2  m
 m  
 
     1.10  10^42 = 1/2
 10^42 = 1/2  3.26
 3.26  10^31
 10^31  
 
                       = (1.10
 = (1.10  10^42
 10^42  2) / (3.26
 2) / (3.26  10^31)
 10^31)
                      v = 0.956 m / s.
 
        
             
        
        
        
Answer:
(a). Z = 54.54 ohm
(b). R = 36 ohm
(c). The circuit will be Capacitive.
Explanation:
Given data
I = 2.75 A
Voltage = 150 V
 rad = 48.72°
 rad = 48.72°
(a). Impedance of the circuit is given by


Z = 54.54 ohm
(b). We know that resistance of the circuit is given by

Put the values of Z &  in above formula we get
 in above formula we get

R = 36 ohm
(c). Since the phase angle is negative so the circuit will be Capacitive.