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3 years ago

Question 18 of 25

Physics

1 answer:

gayaneshka [121]3 years ago

7 0

Answer:

Endothermic, because the reactants are lower in energy (C)

Explanation:

From the graph, you can see the energy of the products is higher than the energy of the reactants. If you recall that when the enthalpy change Eproducts is gretater than Ereactants, the reaction is said to be endothermic.

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3 years ago

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astra-53 [7]

Answer:

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Explanation:

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3 years ago

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3 years ago

Why when objects become charged it is electrons that are transferred from one object to another rather than protons

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3 years ago

A golf club exerts an average horizontal force of 1000 n on a 0.045 -kg golf ball that is initially at rest on the tee. the club

OlgaM077 [116]

The impulse (the variation of momentum of the ball) is related to the force applied by
$\Delta p = F \Delta t$
where $\Delta p$ is the variation of momentum, F is the intensity of the force and $\Delta t$ is the time of application of the force.
Using F=1000 N and $\Delta t = 1.8 ms=1.8 \cdot 10^{-3}s$ , we can find the variation of momentum:
$\Delta p = (1000 N)(1.8 \cdot 10^{-3} s)=1.8 kg m/s$

This $\Delta p$ can be rewritten as
$\Delta p = p_f - p_i = mv_f - mv_i$
where $p_f$ and $p_i$ are the final and initial momentum. But the ball is initially at rest, so the initial momentum is zero, and
$\Delta p = mv_f$
from which we find the final velocity of the ball:
$v_f = \frac{\Delta p }{m}= \frac{1.8 kg m/s}{0.045 kg}= 40 m/s$

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3 years ago