PHYSICS HIGH SCHOOL

A 0.145 kg baseball is thrown horizontally at 15 m/s from a platform, so that it starts at 5.2 m above the ground. How much has its kinetic energy increased when it reaches the ground? 16 J , 24 J , 0 J , or 7.4 J ? :/

Answers

Answer 1
Answer: 7.4J
final kinetic energy
= initial potential energy
= mass x gravitational force x height
= 0.145 x 9.81 x 5.2
= 7.39674 J

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One component of a magnetic field has a magnitude of 0.0404 T and points along the x axis while the other component has a magnitude of 0.0739 T and points along the y axis A particle carrying a charge of 2.80 10 5 C is moving along the z axis at a speed of 4.46 103 m s a Find the magnitude of the net magnetic force that acts on the particle b Determine the angle that the net force makes with respect to the x axis

Answers

Answer:

as we find the resultant of the magnetic field we get in the xy plane. Just perpendicular to this plane i.e. along z-axis the charge is moving. Hence the force acting on the charge will also be in the xy plane.  

Net field = ./(0.078^2 +0.070^2) = 0.105 T  

Angle with x axis is arc tan 0.070/0.072 = 44.2 deg  

So the force acting on the moving charge is got by Bqv  

0.105*5.5*10^-5 * 6*10^3 = 0.03465 N  

So the angle inclined by this force with x axis will be 90+44.2 = 134.2

Explanation:

Help!!! I don't know this answer.

Answers

Work  =  (force on the electron) times (distance the electron is moved).

Can you calculate the force on the electron ?

Sure !   It's pushing against a force of 180 Newtons per Coulomb,
and you know the charge on it.

Do you know the distance it's moved ?

Sure !  That's the 2.5 cm (=0.025 meter) between the plates.

Look at this:

     Work  =    (force)                        x   (distance) 

     =  (180 N/C) x (1.602 x 10⁻¹⁹ C)   x   (0.025 m)

  I get           7.209 x 10⁻¹⁹  N-m.  (joules)         Try it and see if you agree.

What is the acceleration of a 6.4 kilogram bowling ball if a force of 12 N is applied to it?

Answers

F=ma
12=6.4a
1.875=a
A=1.875

Answer:

1.875 m/sec2

Explanation:

Acceleration = Force/Mass

Acceleration = 12/6.4

12/6.4 = 1.875

Units = m/sec2

1875 m/sec2

Draw the Lewis dot Structure for the molecule C2H6​

Answers

Answer:

This means that the Lewis dot structure for C2H6 must account for 14 valence electrons, either through bonding between atoms, or through lone pairs. So, the two C atoms are placed in the center of the molecule.

Sa ma ajute cineva va rog mult Ce cantitate de apă poate fi încălzită de la temperatura t 1 = 10 0 C la temperatura finală T 2 = 293, 15 K, dacă i se furnizează căldura de 41850 J ? Se dă căldura specifică a apei : c apă = 4185

Answers

Răspuns:

1000 kg

Explicaţie:

Date date

t1 = 10 ° C

t2 = 293,15K = până la grad = 293,15-273 = 20,15 ° C

= 20 ° C    aproximativ

Q = 418kJ = 418000J

c = 4180J / kg ° C

m =? Kg

Necesar:

Masa m în kg

Pasul doi:

Formulă:

Q = c * m * Δt

Q = c * m * (t2 -t1)

m = Q / c * (t2-t1)

Calculati:

m = 418000/4180 * (20-10)

m = 100 * 10 kg

m = 1000 kg

Which pair of objects has the largest gravitational force?Choose the correct answer.


marble and car

marble and baseball

car and bowling ball

There is no gravitational force between any of these pairs of objects.

Answers

IF all the pairs are separated by the same distance, then it's the car and the bowling ball.

If I can move them as far apart as I want, then I can make ANY of them have the greatest gravitational attraction between them.
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