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Bess [88]
3 years ago
11

An electric drill transfers 200 J of energy into a useful kinetic energy store. It also transfers 44 J of energy by sound and 48

J of energy by heat. What is the efficiency of this drill? Round your answer to the nearest whole number
Physics
1 answer:
kramer3 years ago
3 0

Answer:

Er = 108 [J]

Explanation:

To solve this problem we must understand that the total energy is 200 [J]. Of this energy 44 [J] are lost in sound and 48 [J] are lost in heat. In such a way that these energy values must be subtracted from the total of the kinetic energy.

200 - 44 - 48 = Er

Where:

Er = remaining energy [J]

Er = 108 [J]

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A bug is moving along a meter stick in the negative direction at a constant speed of 0.85cm/s. After 42 seconds have passed the
Agata [3.3K]

Given that,

bug speed, v= 0.85 m/s

time, t =42 s

Final position of bug on meter stick was 27 cm

Starting position of bug on meter stick = ?

Since we know that,

s = vt

s= 0.85*42 = 35.7 cm

this is the distance covered by bug in the given time and velocity.

since the bug is moving in negative direction, starting point will be:

27.0 cm+ 35.7 cm = 62.7 cm

The bugs starting position on meter stick was 62.7 cm.

3 0
3 years ago
A coil 3.85 cm radius, containing 450 turns, is placed in a uniform magnetic field that varies with time according to B=( 1.20×1
Nimfa-mama [501]

Answer:

0.025V + (0.000218V/s³) t³

Explanation:

Parameters given:

Radius of coil, r = 3.85 cm = 0.0385 m

Number of turns, N = 450

Magnetic field, B = ( 1.20×10^(−2) T/s )t + (2.60×10^(−5) T/s4 )t^4.

The magnitude of Induced EMF is given as:

E = N * A * dB/dt

Where A is the area of the coil

First, we differentiate the magnetic field with respect to time:

dB/dt = 0.012 + 0.000104t³

Therefore, EMF will be:

E = 450 * 3.142 * (0.012 + 0.000104t³)

E = 2.096(0.012 + 0.000104t³)

E = 0.025V + (0.000218V/s³)t³

6 0
3 years ago
Read 2 more answers
Help please I'm struggling.
Mrrafil [7]
Well, collinear points  are points in same line,

that is a straight line is formed by connecting them,
here the line segment   mE  has point A,G,C,E   so all these are collinear..

so, option c)  E will be answer

hope it helped
4 0
3 years ago
Write a scientific explanation to describe where earthquakes and volcanoes most commonly occur and their relation to plate bound
vovangra [49]
Earthquakes and volcanoes most commonly occur around plate boundaries because of the movement from the plate boundaries. The interactions between the plates by moving under, upon, or sliding against other boundaries may cause earthquakes and volcanoes.
4 0
3 years ago
A 5.17 kg block free to move on a horizontal, frictionless surface is attached to one end of a light horizontal spring. The othe
Andreyy89

Answer:

v=0.816 m/s

Explanation:

The force of the spring and the motion of the block are in equilibrium so without any force of friction the motion is

E_{s}=E_{k}

\frac{1}{2}*k*d_{s}^2=\frac{1}{2}*m*v^2

First determinate the constant of the spring that produce the kinetic energy of the bloc

k=\frac{m*v^2}{d_{s}^2}

k=\frac{5.17kg*(1.30\frac{m}{s})^2}{0.102^2m}

k=839.8 \frac{kg}{s^2}

Now the motion with the force of friction in the kinetic

E_{s}=E_{k}-W_{k}

\frac{1}{2}*k*d_{s}^2=\frac{1}{2}*m*v^2-u*m*g

Resolve to v

v^2=\frac{(k*d_{s}^2)+(2*g*u)}{m}

v=\sqrt{\frac{839.8*(0.102m)^2-2*9.8*0.270}{5.17}}

v=0.81 \frac{m}{s}

3 0
3 years ago
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