Answer:
A.
Explanation:
The normal force is always perpendicular to the surface of contact, her weight is always pointing straight down (or towards the center of Earth), and the friction opposes the direction of her motion. Free body diagram A. is the only one that fits properly displays those 3 things.
For the answer tot the question above, it is Thermal energy is the portion of internal energy that can be transferred from one substance to another. It is the energy that comes from heat. This is generated by the movement of the particles in an object.
Thermal energy is the energy and object or system has due to the movement of particles within. This results in the object or system having an internal <span>temperature that can be measured with a thermometer.</span>
Answer:
(c) The planet must have a mass about the same as the mass of Jupiter,
(d) The planet must be closer to the star than Earth is to the Sun.
Explanation:
Astrometry is the ideal method to detect high-mass planets that are close to their star. That is because the gravitational effect that it will have the planet over its host star will be greater. This effect can be seen as a wobble in the star as a consequence of how they orbit a common center of mass¹. The center of mass will be closer to the most massive object, So, in the case of an extrasolar planet with masses like Jupiter (Jovian), this point will be a little bit farther from the star, making the wobble more notable than in a system with a low-mass planet.
Key terms:
Astrometry: study of the position of the stars over time in the sky.
¹Center of mass: a geometrical point in which the mass from a whole system is summed.
Solution :
Speed of the air craft, = 262 m/s
Fuel burns at the rate of, = 3.92 kg/s
Rate at which the engine takes in air, = 85.9 kg/s
Speed of the exhaust gas that are ejected relative to the aircraft, =921 m/s
Therefore, the upward thrust of the jet engine is given by
F = 85.9(921 - 262) + (3.92 x 921)
= 4862635.79 + 3610.32
=
Therefore thrust of the jet engine is .
Answer:
the work done by air resistance is 38.5 J
Explanation:
given information:
mass of the ball, m = 0.25 kg
initial speed, = 40 m/s
final speed, = 30 m/s
horizontal distance, x = 120 m
Δh = 20 m
according to conventional energy
W = -
where
is initial energy
is final energy
E = KE + PE
KE is kinetic energy
PE is potential energy
W = -
= mg + - (mg + )
= mg( )+
= m (gΔh + )
= 0.25 ( (9.8) (20) + )
= - 38.5 J