Figure 9-44 shows an arrangement with an air track, in which a cart is connected by a cord to a hanging block. The cart has mass m 1 = 0.600 kg, and its center is initially at xy coordinates (−0.500 m, 0 m); the block has mass m 2 = 0.400 kg, and its center is initially at xy coordinates (0, −0.100 m).The mass of the cord and pulley are negligible. The cart is released from rest, and both cart and block move until the cart hits the pulley. The friction between the cart and the air track and between the pulley and its axle is negligible, (a) In unit-vector notation, what is the acceleration of the center of mass of the cart–block system? (b) What is the velocity of the com as a function of time t ? (c) Sketch the path taken by the com. (d) If the path is curved, determine whether it bulges upward to the right or downward to the left, and if it is straight, find the angle between it and the x axis. Figure 9-44 Problem 15.
Figure 9-44 shows an arrangement with an air track, in which a cart is connected by a cord to a hanging block. The cart has mass m 1 = 0.600 kg, and its center is initially at xy coordinates (−0.500 m, 0 m); the block has mass m 2 = 0.400 kg, and its center is initially at xy coordinates (0, −0.100 m).The mass of the cord and pulley are negligible. The cart is released from rest, and both cart and block move until the cart hits the pulley. The friction between the cart and the air track and between the pulley and its axle is negligible, (a) In unit-vector notation, what is the acceleration of the center of mass of the cart–block system? (b) What is the velocity of the com as a function of time t ? (c) Sketch the path taken by the com. (d) If the path is curved, determine whether it bulges upward to the right or downward to the left, and if it is straight, find the angle between it and the x axis. Figure 9-44 Problem 15.
Figure 9-44 shows an arrangement with an air track, in which a cart is connected by a cord to a hanging block. The cart has mass m1 = 0.600 kg, and its center is initially at xy coordinates (−0.500 m, 0 m); the block has mass m2 = 0.400 kg, and its center is initially at xy coordinates (0, −0.100 m).The mass of the cord and pulley are negligible. The cart is released from rest, and both cart and block move until the cart hits the pulley. The friction between the cart and the air track and between the pulley and its axle is negligible, (a) In unit-vector notation, what is the acceleration of the center of mass of the cart–block system? (b) What is the velocity of the com as a function of time t? (c) Sketch the path taken by the com. (d) If the path is curved, determine whether it bulges upward to the right or downward to the left, and if it is straight, find the angle between it and the x axis.
L₁
D₁
L₂
D2
Aluminum has a resistivity of p = 2.65 × 10 8 2. m. An aluminum wire is L = 2.00 m long and has a
circular cross section that is not constant. The diameter of the wire is D₁ = 0.17 mm for a length of
L₁ = 0.500 m and a diameter of D2 = 0.24 mm for the rest of the length.
a) What is the resistance of this wire?
R =
Hint
A potential difference of AV = 1.40 V is applied across the wire.
b) What is the magnitude of the current density in the thin part of the wire?
Hint
J1
=
c) What is the magnitude of the current density in the thick part of the wire?
J₂ =
d) What is the magnitude of the electric field in the thin part of the wire?
E1
=
Hint
e) What is the magnitude of the electric field in the thick part of the wire?
E2
=
please help
A cheetah spots a gazelle in the distance and begins to sprint from rest, accelerating uniformly at a rate of 8.00 m/s^2 for 5 seconds. After 5 seconds, the cheetah sees that the gazelle has escaped to safety, so it begins to decelerate uniformly at 6.00 m/s^2 until it comes to a stop.
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