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1. ### A concave cosmetic mirror has a focal length of 38 cm . A 3.0- cm -long mascara brush is held upright 19 cm from the mirror.?

...v 1 / v = 1 / f - 1 / u 1 / v = 1 / 38 - 1 / 19 = (1 - 2) / 38 = - 1 / 38 v = - 38 cm The image distance is negative —> the image is virtual, ...

1 Answers · Science & Mathematics · 19/11/2020

2. ### The candle is 3.2 cm from the cutout; how far is the candle from the wall?

"compact" implies "point-like"; use similar triangles 3.2cm / 8.2cm = d / 16cm d = 6.2 cm

2 Answers · Science & Mathematics · 23/11/2020

3. ### Two parallel plates, each having area A = 2291 cm ?

1) By C = ɛA/d =>C = [8.85 × 10^−12 x 2291 x 10^-4]/[0.46 x 10^-2] =>C = 440.77 x 10^-12 F Now by Q = CV =>Q = 440.77 x 10^-12 x 6  =>Q = 2.64 x 10^-9 C 2) By U = 1/2CV^2 =>U = 1/2 x 440.77 x 10...

2 Answers · Science & Mathematics · 12/11/2020

4. ### An 11 g bullet is accelerated in a rifle barrel 36.5 cm long to a speed of 548 m/s. ?

The work of the force will change the kinetic energy of the mass neglecting friction Fd = ½m(vf² - vi²) F = ½(0.011)(548² - 0²) / 0.365 = 4,525.128... N round as appropriate. Please remember to select a...

1 Answers · Science & Mathematics · 30/11/2020

5. ### Assume that the top of your head has a surface area of 25 cm x 25 cm . How many newtons of force push on your head at sea level?

14psi * 100in^2 = 1400 lb

2 Answers · Science & Mathematics · 26/11/2020

6. ### A solid insulating sphere of radius a = 3.4 cm is fixed at the origin of a co-ordinate system as shown?

Solution in image.

1 Answers · Science & Mathematics · 10/11/2020

1 liter is 1000 cm ^3 The hose area is 19.635 cm ^2 so the velocity needed is...

1 Answers · Science & Mathematics · 03/12/2020

8. ### Lens Physics Question?

...value for "v" to get 1/f = 1/9 - 1/13.5 1/f = 3/27 - 2/27 = 1/27 f = 27 cm B) height of the image hi/ho = - v/u hi = 2.90 * 13.5/ 9 = 4.35 cm C...

1 Answers · Science & Mathematics · 17/11/2020

9. ### Mass on Incline Physics  ?

Unstretched spring length = 40 - 20 = 20 cm stretched spring length = √((90 - 10)² + (70 - 40)²) = 85.44 cm ...

2 Answers · Science & Mathematics · 03/12/2020