PHYSICS HIGH SCHOOL

The unit for measuring the rate at which light energy is radiated from a source is the A. Angstrom.
B. lux.
C. lumen.
D. candela.

Answers

Answer 1
Answer: The correct answer is letter D. candela. The unit for measuring the rate at which light energy is radiated from a source is the candela. Lumen is the unit for measuring the total amount of visible light emitted by a source. Lux is lumen per square meter. 

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Calculate the speed of the ball, vo in m/s, just after the launch. A bowling ball of mass m = 1.5 kg is launched from a spring compressed by a distance d = 0.21 m at an angle of θ = 32° measured from the horizontal. It is observed that the ball reaches a maximum height of h = 4.4 m, measured from the initial position of the ball. Let the gravitational potential energy be zero at the initial height of the bowling ball.

Answers

Answer:

v_0=17.3m/s

Explanation:

In this problem we have three important moments; the instant in which the ball is released (1), the instant in which the ball starts to fly freely (2) and the instant in which has its maximum height (3). From the conservation of mechanical energy, the total energy in each moment has to be the same. In (1), it is only elastic potential energy; in (2) and (3) are both gravitational potential energy and kinetic energy. Writing this and substituting by known values, we obtain:

E_1=E_2=E_3\n\nU_e_1=U_g_2+K_2=U_g_3+K_3\n\n(1)/(2)kd^2=mg(d\sin\theta)+(1)/(2)mv_0^2=mgh+(1)/(2)m(v_0\cos\theta)^2

Since we only care about the velocity v_0, we can keep only the second and third parts of the equation and solve:

mgd\sin\theta+(1)/(2)mv_0^2=mgh+(1)/(2)mv_0^2\cos^2\theta\n\n(1)/(2)mv_0^2(1-\cos^2\theta)=mg(h-d\sin\theta)\n\nv_0=\sqrt{(2g(h-d\sin\theta))/(1-\cos^2\theta)}\n\nv_0=\sqrt{(2(9.8m/s^2)(4.4m-(0.21m)\sin32\°))/(1-\cos^232\°)}\n\nv_0=17.3m/s

So, the speed of the ball just after the launch is 17.3m/s.

Does sit-ups reduce belly fat?

Answers

yes it does because it exercises the muscles :)) 
It does. When you are doing sit ups, it makes your core work and if you have a good strong core then you are burning fat. 

What units are used to measure mass and weight?

Answers

grams, kilograms, pounds for mass

newtons for weight

The weight of an object isa. the force of gravity on its mass.
b. the amount of matter in an object.
c. the tendency of an object to resist motion.
d. the tendency of an object to continue moving in a straight line.

Answers

The weight of an object is the force of gravity on its mass. The answer is letter A. The acceleration due to gravity is the acceleration on an object caused by force of gravitation. It means that the earth has a gravitational field that projects all bodies on earth towards its center. The gravity of an object or body of an object is high on earth than at the atmosphere. It has an average of gravitational constant equal to 9.8066 or 9.8 meters per second. In truth, the acceleration of the object depend upon its location, the latitude and altitude, on earth.     

The splitting of an atom to produce energy is called a ________ reaction.a. fusion
b. fission
c. physical
d. chemical

Answers

The correct answer is fission.

Answer: The answer to this question is fission

Explanation: Can I get brainliest

Compare the charges and masses of protons, neutrons and electrons.

Answers

proton = positive charge (relative mass of 1836)

neutron = neutral or no charge (relative mass of 1839)

electron = negative charge (relative mass of 1)
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