. AYUDA URGENTE ES OARA UN EXAMEN AHORITA Un automóvil de 4kg parte con una velocidad de 35 km/h y se desplaza en el plano durante 1.5 hr. Posteriormente asciende por una pendiente de 43.2º a una velocidad de 25 km/h y trascurre un tiempo de 15 min. Se dese conocer:

a. La energía mecánica
b. El trabajo realizado
c. La potencia que se requiere
.
Determine la velocidad, la fuerza y distancia que recorre un ciclista cuya masa es de 97 kg si su energía cinética es de 630 J y trascurre un tiempo de 0,5 h.

. Se lanza verticalmente hacia arriba una pelota de 0.4 kg con una velocidad de 30 m/s. Calcular:

a. El valor de la energía cinética y potencial
b. La energía cinética y potencial a 15m de altura
c. La energía mecánica del desplazamiento.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.