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1. ### Electric field Question:"An electron with a speed of 7.28 × 108 cm/s in the positive direction of an x axis?

"is there a formula for Velocity and Electric field E?" Not directly, but there is a formula for Force and electric field: F = q*E where q is the charge and so the acceleration a = q*E/m where m is the mass and so the change in...

1 Answers · Science & Mathematics · 06/09/2019

2. ### In order to start a fire, a camper turns a lens toward the sun to focus its rays on a piece of wood. The lens has a 10 cm focal length.?

10cm behind the lens

1 Answers · Science & Mathematics · 19/05/2019

3. ### What are the basic SI units for the wavelength of light? What are the basic SI units for the wavelength of light? m s cm kg?

Wavelength is measured in metres. Metres m.

4 Answers · Science & Mathematics · 06/11/2019

4. ### What is the frequency of electromagnetic radiation that has a wavelength of 0.325 cm?

Given, Wavelength (λ) = 0.325cm = 0.32 x 10¯²m Speed of light (c) = 3 x 10⁸ m/sec Frequency (f) = ? We know that:- Wavelength (λ) = speed of light (c) / frequency (f) Frequency (f) = speed of light (c) / wavelength (λ) = 3 x...

4 Answers · Science & Mathematics · 16/05/2019

5. ### Two objects attract each other with a gravitational force of magnitude 9.40 10-9 N when separated by 19.7 cm.?

m1 = 5.03-m2 m1*m2 = F*d^2/G (5.03-m2)*m2 = 9.40*10^-9*17.7^2*10^-4*10^11/6.67 5.47-5.03m2+m2^2 = 0 m2 = (5.03+√5.03^2-21.88)/2 = 3.44 kg m1 = (5.03-√5.03^2-21.88)/2 = 1.59 kg m1+m2 = 3.44+ 1.59 = 5.03 kg

2 Answers · Science & Mathematics · 18/10/2019

6. ### Two 2.0 g plastic buttons each with + 80 nC of charge are placed on a frictionless surface 2.0 cm (measured between centers)..?

Any two point (or small enough to be considered point) charges q1 and q2 at distance r from each other have a potential energy kq1q2/r measured relative to infinity. So at the start, there is the potential energy between the two small buttons, and the potential energy between each...

1 Answers · Science & Mathematics · 02/02/2019

7. ### A rectangular metal plate has dimensions of 10.0 cm by 6.00 cm by 4.00 mm. Find the plate’s volume in m3. (Enter the unit m3 as m^3)?

V = 1*0.6*0.04*10^-3 = 2.4*10^-5 m^3

2 Answers · Science & Mathematics · 08/09/2019

8. ### A 250 g baseball is pitched at 26 m/s spinning at 45 rad/s . You can treat the baseball as a uniform solid sphere of radius 2.7 cm?

KE = ½mV² = ½(0.25)(26)² = 84.5 J I = cMR² = (2/5)(1/4)(0.027)² = 0.0000729 kg•m² AKE = ½Iω² = ½(0.0000729)(45)² = 0.0738 J Total energy = 84.6 percent...

1 Answers · Science & Mathematics · 20/10/2019

9. ### A block of material has dimensions 4.5 cm by 8.2cmby5.3cm.Itsmassis623g. What is the density? 3 Answer in units of g/cm .?

623/(4.5 x 8.2 x 5.3) = 623/195.57 = 3.19 g/cm3

2 Answers · Science & Mathematics · 17/02/2019

10. ### the diameter of an atom is 9.1 x 10⁻⁹ cm. The accepted value for this diameter is 1.54 x 10⁻⁸ cm. What is the percent error?

This is not how errors are calculated. There can be NO presumption that the "accepted values" are correct. Errors are determined by analyzing each part of your experiment...

3 Answers · Science & Mathematics · 14/08/2019