Seismic velocities tend to gradually increase with depth in the mantle due to the increasing pressure, and therefore density, with depth
<u>Answer</u>:
"Chemical bonds are formed or broken" is NOT true about physical properties.
<u>Explanation</u>:
Any characteristic that could be determined without changing composition of the substance is called as physical properties.A object can be observed or described using a physical property. Physical properties of a substance include only size, shape and physicality in a general aspect.
It does not include how its chemical properties like bonds or which type of elements combined to form a compound likewise. Hence formation or breaking of chemical bonds does not determine the physical properties
Answer:
D) As you drive faster in the rain more raindrops strike your windshield.
Explanation:
- The Doppler effect occurs when there is a change in the frequency of the source wave with respect to the motion of the observer.
- There is an apparent increase in the frequency of the emitted source when an observer moves towards the source.
- The wavelength stretches when an observer moves away from the emitting source.
- Consider the rain droplets fall towards the Earth in a slightly slanted towards eastwards. So, if you drive westwards, the frequency of the rain droplets hitting the windshield is higher.
- Similarly, if you drive eastwards, the frequency of the rain droplets striking your windshield will be lower.
Answer:
a) El remolque desciende 7.4 cm
b) La carga debe ser de 15715.6 N ó 1603.6 kg
Explanation:
Para los cálculos que involucren muelles, se aplica la Ley de Hooke, la cual relaciona el efecto de una Fuerza y el cambio de longitud que esta ejerce, en un resorte de elasticidad dada.
Escrito en fórmula:
Donde:
F es la fuerza ejercida
k es la constante elástica del muelle
ΔL es la variación de longitud del muelle
El problema indica que al cargar 2100 kg se ejerce una fuerza de 20580 N
Esto se corrobora con la 2da ley de Newton y asumiendo una aceleración de gravedad de 9.8
Esta fuerza comprime o reduce la longitud del muelle en 5.5 cm. Usando estos datos en la Ley de Hooke, podemos obtener la constante elástica k:
Ahora ya tenemos los datos para resolver las preguntas:
- a) <em>Longitud que desciende el remolque si se carga con 28000 N</em>
Aplicando directamente la formula de la Ley de Hooke:
- b) <em>Si ha descendido 4,2 cm la carga</em>
En este caso debemos calcular la fuerza necesaria que haga descender el remolque 4.2cm. Nuevamente utilizando la Ley de Hooke con estos nuevos datos:
Si queremos saber la carga en kilogramos: